Method and system for providing information about time zone of a wireless communication device

ABSTRACT

A method and mobile device configured to display time zone information of a destination mobile device to which the mobile device connects based on time zone information of the mobile device and the destination mobile device.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.14/592,400 filed Jan. 8, 2015, which claims priority from Korean PatentApplication No. 10-2014-0029259, filed on Mar. 12, 2014, and KoreanPatent Application No. 10-2014-0062624, filed on May 23, 2014, in theKorean Intellectual Property Office, the disclosures of which areincorporated herein by reference in their entireties.

BACKGROUND 1. Field

Aspects of exemplary embodiments relate to a method and system forproviding time zone information of a second wireless communicationdevice that is located at a different time zone from a time zone atwhich a first wireless communication device is located.

2. Description of the Related Art

Mobile terminals and wireless communication devices are portableapparatuses that perform various functions, including making voice andvideo calls while moving, for example. Such mobile terminals may alsoperform more complex functions, such as photography or video, playbackof music files or video files, gaming, reception of broadcasts, andaccessing the Internet.

SUMMARY

Aspects of exemplary embodiments include a method and system forproviding the time zone information of an external wirelesscommunication device, in which a first wireless communication deviceprovides the time zone information of a second wireless communicationdevice located in a different time zone from that of the first wirelesscommunication device so that a user of the first wireless communicationdevice may determine whether a user of the second wireless communicationdevice is available for communication.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments.

According to an aspect of an exemplary embodiment, there is provided afirst wireless communication device including a storage unit configuredto store identification information of a second mobile device, acommunication unit configured to receive time zone information of themobile device, a processor configured to compare time zone informationof the wireless communication device with the time zone information ofthe mobile device, and a display unit configured to display the timezone information of the mobile device in correspondence to theidentification information of the mobile device when the time zoneinformation of the wireless communication device is different from thetime zone information of the mobile device.

According to an aspect of an exemplary embodiment, there is provided amobile device including a display, a memory configured to store timezone information of a destination mobile device, and a processorconfigured to determine whether the destination mobile device isavailable for communication with the mobile device based on time zoneinformation of the mobile device and time zone information of thedestination mobile device.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects will become apparent and more readilyappreciated from the following description of the exemplary embodiments,taken in conjunction with the accompanying drawings in which:

FIG. 1 is a block diagram for illustrating communication betweenwireless communication devices located at different time zones;

FIG. 2 is a block diagram of a system for providing time zoneinformation of wireless communication device, according to an exemplaryembodiment;

FIG. 3 is a flowchart of a method of providing time zone information ofa wireless communication device, according to an exemplary embodiment;

FIG. 4 is a flowchart of a method in which a first wirelesscommunication device receives time zone information of the secondwireless communication device, according to an exemplary embodiment.

FIG. 5 is a flowchart of a method in which the first wirelesscommunication device receives the time zone information of the secondwireless communication device, according to an exemplary embodiment;

FIG. 6 is a flowchart of a method in which related wirelesscommunication devices receive time zone information of other wirelesscommunication devices from the other wireless communication devices,according to an exemplary embodiment;

FIG. 7 is a flowchart of a method in which related wirelesscommunication devices receive time zone information displayed on contactinformation in the related wireless communication devices in a batchmanner, according to an exemplary embodiment;

FIG. 8 is a flowchart of a method of displaying the time zoneinformation of the second wireless communication device on the contactinformation in the first wireless communication device, according to anexemplary embodiment;

FIG. 9 is a flowchart of a method of updating and displaying time zoneinformation while a contact information application is being executed,according to an exemplary embodiment;

FIGS. 10A-10B are contact information application execution screensaccording to an exemplary embodiment;

FIGS. 11A and 11B illustrate a contact information screen that isdisplayed according to whether the time zone information of the secondwireless communication device is equal to or different from the timezone information of the first wireless communication device, accordingto an exemplary embodiment;

FIGS. 12A and 12B illustrate a contact information screen that isdisplayed according to whether the time zone information of the secondwireless communication device is made accessible, according to anexemplary embodiment;

FIGS. 13A and 13B illustrate a screen that is displayed when the secondwireless communication device sets time zone information thereof to beinaccessible, according to an exemplary embodiment;

FIGS. 14A-14D illustrate an example in which the time zone informationof the second wireless communication device is displayed on a contactinformation screen of the first wireless communication device, accordingto an exemplary embodiment;

FIG. 15 illustrates an example in which the time zone information of thesecond wireless communication device is displayed on a contactinformation detailed information providing screen of the first wirelesscommunication device, according to an exemplary embodiment;

FIG. 16 is a flowchart of a method of displaying the time zoneinformation of the second wireless communication device in a messagewindow of the first wireless communication device, according to anexemplary embodiment;

FIGS. 17A, 17B, and 18 illustrate an example in which the time zoneinformation of the second wireless communication device is displayed inthe message window of the first wireless communication device, accordingto an exemplary embodiment;

FIGS. 19A and 19B illustrate an example of displaying the time zoneinformation of the second wireless communication device in the messagewindow of the first wireless communication device, according to anexemplary embodiment;

FIG. 20 illustrates a message window displayed on the first wirelesscommunication device during message exchange between the first andsecond wireless communication devices, according to an exemplaryembodiment;

FIG. 21 illustrates a message screen displayed on the first wirelesscommunication device during message exchange between the first andsecond wireless communication devices, according to an exemplaryembodiment;

FIG. 22 is a flowchart of a method of making a reservation for messagetransmission from the first wireless communication device to the secondwireless communication device, according to an exemplary embodiment;

FIGS. 23A and 23B illustrate a message transmission reservation settingscreen according to an exemplary embodiment;

FIG. 24 is a flowchart of a method of displaying the time zoneinformation of the second wireless communication device when a callapplication in the first wireless communication device is executed,according to an exemplary embodiment;

FIGS. 25A-25D illustrate an example in which the first wirelesscommunication device displays the time zone information of the secondwireless communication device before a call is connected to the secondwireless communication device 200, according to an exemplary embodiment;

FIG. 26 is a flowchart of a method of displaying the time zoneinformation of the second wireless communication device when the firstwireless communication device selects a call key, according to anexemplary embodiment;

FIGS. 27A and 27B illustrate an example in which the first wirelesscommunication device displays the time zone information of the secondwireless communication device when requesting a call connection to thesecond wireless communication device, according to an exemplaryembodiment;

FIGS. 28A and 28B illustrate an example in which the first wirelesscommunication device displays the time zone information of the secondwireless communication device when requesting a call connection to thesecond wireless communication device, according to an exemplaryembodiment;

FIGS. 29A and 29B illustrate an example in which the first wirelesscommunication device displays the time zone information of the secondwireless communication device when requesting a call connection to thesecond wireless communication device, according to an exemplaryembodiment;

FIGS. 30A and 30B illustrate an example in which the first wirelesscommunication device displays the time zone information of the secondwireless communication device when requesting a call connection to thesecond wireless communication device, according to an exemplaryembodiment;

FIGS. 31A and 31B illustrate a call reservation setting screen accordingto an exemplary embodiment;

FIGS. 32A and 32B illustrate an example in which the first wirelesscommunication device displays the time zone information of the secondwireless communication device when requesting a call connection to thesecond wireless communication device, according to an exemplaryembodiment;

FIGS. 33A and 33B illustrate a call request message setting screenaccording to an exemplary embodiment;

FIG. 34 illustrate an example in which the first wireless communicationdevice displays the time zone information of the second wirelesscommunication device when receiving a call connection request from thesecond wireless communication device 200, according to an exemplaryembodiment;

FIG. 35 illustrates an example in which the first wireless communicationdevice displays the time zone information of the second wirelesscommunication device when an SNS application is executed, according toan exemplary embodiment;

FIG. 36 illustrates an example in which the first wireless communicationdevice displays the time zone information of the second wirelesscommunication device when an e-mail application is executed, accordingto an exemplary embodiment;

FIG. 37 is a flowchart of a method in which the first wirelesscommunication device receives the time zone information of the secondwireless communication device based on whether the time zone informationof the second wireless communication device is made accessible,according to an exemplary embodiment;

FIG. 38 is a flowchart of a method in which the first wirelesscommunication device receives the time zone information of the secondwireless communication device based on the range in which the time zoneinformation of the second wireless communication device is madeaccessible, according to an exemplary embodiment;

FIG. 39 is a flowchart of a method in which the first wirelesscommunication device receives the time zone information of the secondwireless communication device when the second wireless communicationdevice sets the time zone information of the second wirelesscommunication device to be made accessible as brief information,according to an exemplary embodiment;

FIGS. 40, 41A, and 41B illustrate a screen for setting whether the timezone information of the second wireless communication device is madeaccessible;

FIGS. 42A-44B illustrate examples in which the first wirelesscommunication device displays information about the user of the secondwireless communication device, according to an exemplary embodiment;

FIGS. 45 and 46 are block diagrams of a structure of the first wirelesscommunication device, according to an exemplary embodiment; and

FIG. 47 is a block diagram of a structure of a server, according to anexemplary embodiment.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Reference will now be made in detail to exemplary embodiments, examplesof which are illustrated in the accompanying drawings, wherein likereference numerals refer to the like elements throughout. In thisregard, the exemplary embodiments may have different forms and shouldnot be construed as being limited to the descriptions set forth herein.Accordingly, the exemplary embodiments are merely described below, byreferring to the figures, to explain aspects of the present description.As used herein, the term “and/or” includes any and all combinations ofone or more of the associated listed items.

The terminology used herein will now be briefly described as the presentinvention will be described in detail based on this terminology.

Although general terms widely used at present were selected fordescribing the exemplary embodiments in consideration of the functionsthereof, these general terms may vary according to intentions of one ofordinary skill in the art, case precedents, the advent of newtechnologies, and the like. Terms arbitrarily selected may also be usedin a specific case. In this case, their meanings need to be given in thedetailed description. Hence, the terms must be defined based on theirmeanings and the contents of the entire specification, not by simplystating the terms.

The terms “comprises” and/or “comprising” or “includes” and/or“including” when used in this specification, specify the presence ofstated elements, but do not preclude the presence or addition of one ormore other elements. The terms “ . . . unit” and “ . . . module” whenused in this specification refers to a unit in which at least onefunction or operation is performed, and may be implemented as hardware,software, or a combination of hardware and software.

Exemplary embodiments are described in detail herein with reference tothe accompanying drawings so that this disclosure may be easilyperformed by one of ordinary skill in the art to which the presentinvention pertain. The exemplary embodiments may, however, be embodiedin many different forms and should not be construed as being limited tothe embodiments set forth herein. In the drawings, parts irrelevant tothe description are omitted for simplicity of explanation, and likenumbers refer to like elements throughout.

FIG. 1 is a block diagram for illustrating communication betweenwireless communication devices located at different time zones.

Referring to FIG. 1, a first wireless communication device 100 and asecond wireless communication device 200 according to an exemplaryembodiment may be the wireless communication devices located atdifferent time zones. Here, a time zone is a time division line devisedto artificially adjust a time difference between regions based on theRoyal Observatory in Greenwich, London (i.e., at longitude 0°), namely,a day/night difference between regions caused by the rotation of theearth.

For example, the first wireless communication device 100 may be inSeoul, and the second wireless communication device 200 may be in SanFrancisco. In other words, the first wireless communication device 100may be located at a first time zone (i.e., the time zone of Seoul), andthe second wireless communication device 200 may be located at a secondtime zone (i.e., the time zone of San Francisco) that is different fromthe first time zone. Because the first time zone (i.e., the time zone ofSeoul) is 9 hours later than Greenwich, the first time zone may be“Greenwich Mean Time (GMT)+9”.

Because the second time zone (i.e., the time zone of San Francisco) is 8hours faster than Greenwich, the second time zone may be “GMT-8”. Inthis case, a user of the first wireless communication device 100(hereinafter, referred to as a first user) and a user of the secondwireless communication device 200 (hereinafter, referred to as a seconduser) are at different times. For example, when the first user is atdaytime, the second user may be at nighttime. In this case, the firstuser may make a call or send a message to the second wirelesscommunication device 200 while the second user is sleeping.

Accordingly, a system for providing time zone information of an externalwireless communication device according to an exemplary embodiment mayprovide the first wireless communication device 100 with time zoneinformation of the second wireless communication device 200 and thesecond wireless communication device 200 with time zone information ofthe first wireless communication device 100 so that the first user maycontact the second user in consideration of the time of the second userand the second user may contact the first user in consideration of thetime of the first user.

If the first user talks with the second user based on their time zones,for example, if the first user sends a message “I will call you again at10 am tomorrow”, wherein “10 am tomorrow” is based on the first timezone, to the second wireless communication device 200, the second userin the second time zone may recognize “10 am tomorrow” based on thefirst time zone, as “10 am tomorrow” based on the second time zone. Inthis case, smooth communication between the first user and the seconduser may not be performed.

Accordingly, the system for providing time zone information of anexternal wireless communication device according to an exemplaryembodiment may provide the second wireless communication device 200 withthe time zone information of the first wireless communication device 100so that the second wireless communication device 200 displays timeinformation based on the second time zone instead of “10 am tomorrow”based on the first time zone. Consequently, the second user mayrecognize the accurate month, date, and time of “10 am tomorrow”.

The system for providing time zone information of an external wirelesscommunication device according to an exemplary embodiment will now bedescribed in greater detail with reference to FIG. 2.

FIG. 2 is a block diagram of a system for providing time zoneinformation of an external wireless communication device, according toan exemplary embodiment.

Referring to FIG. 2, the system may include a first wirelesscommunication device 100, a second wireless communication device 200,and a server 300.

The first wireless communication device 100 and the second wirelesscommunication device 200 according to an exemplary embodiment may eachinclude a communication module for performing communication with anexternal wireless communication device or the server 300. For example,the first wireless communication device 100 may communicate with theserver 300 or the second wireless communication device 200 via its owncommunication module, and the second wireless communication device 200may communicate with the server 300 or the first wireless communicationdevice 100 via its own communication module.

Accordingly, the first wireless communication device 100 may transmittime zone information of the first wireless communication device 100 tothe server 300, and the second wireless communication device 200 maytransmit time zone information of the second wireless communicationdevice 200 to the server 300.

When the time zone information of the first wireless communicationdevice 100 or the second wireless communication device 200 changes, whenthe first wireless communication device 100 or the second wirelesscommunication device 200 is turned on, when the first wirelesscommunication device 100 or the second wireless communication device 200connects to a new base station, and when the first wirelesscommunication device 100 connects to a new Internet Protocol (IP), thefirst wireless communication device 100 or the second wirelesscommunication device 200 may transmit the time zone information of thefirst wireless communication device 100 or the second wirelesscommunication device 200 to the server 300.

The first wireless communication device 100 may receive the time zoneinformation of the second wireless communication device 200 from theserver 300, and the second wireless communication device 200 may receivethe time zone information of the first wireless communication device 100from the server 300.

The first wireless communication device 100 and the second wirelesscommunication device 200 according to an exemplary embodiment may beimplemented as various types. For example, the first wirelesscommunication device 100 and the second wireless communication device200 may be mobile phones, smartphones, laptop computers, tablet PCs,e-book terminals, digital broadcasting terminals, personal digitalassistants (PDAs), portable multimedia players (PMPs), navigations, MP3players, digital cameras, Internet Protocol televisions (IPTVs), digitaltelevisions (DTVs), consumer electronics (CE) apparatuses (e.g., arefrigerator and an air-conditioner each including a display apparatus),or the like, but they are not limited thereto. The terms wirelesscommunication device and mobile device should be understood to be usedinterchangeably.

The first wireless communication device 100 or the second wirelesscommunication device 200 may be a wearable wireless communication devicethat is wearable by users. For example, the first wireless communicationdevice 100 and the second wireless communication device 200 may bewatches, glasses, rings, bracelets, necklaces, hair bands, or the like.

The server 300 according to an exemplary embodiment may communicate withthe first wireless communication device 100 or the second wirelesscommunication device 200. For example, the server 300 may receive userauthentication information or wireless communication deviceidentification information from the first wireless communication device100 or the second wireless communication device 200. Accordingly, theserver 300 may recognize the first or second user based on the userauthentication information, and may identify the first wirelesscommunication device 100 or the second wireless communication device 200on the wireless communication device identification information. Theuser authentication information may include a user identifier, a userpassword, a user account, and the like, and the server 300 may identifythe first or second user based on the user authentication information.

The server 300 may also receive time zone information from the firstwireless communication device 100 or the second wireless communicationdevice 200. In this case, the server 300 may receive time zoneinformation from the first wireless communication device 100 or thesecond wireless communication device 200 at regular intervals.Alternatively, when the time zone information of the first wirelesscommunication device 100 or the second wireless communication device 200changes (e.g., when the first wireless communication device 100 or thesecond wireless communication device 200 is moved to another country),when the first wireless communication device 100 or the second wirelesscommunication device 200 is turned on, when the first wirelesscommunication device 100 or the second wireless communication device 200connects to a new base station, when the first wireless communicationdevice 100 or the second wireless communication device 200 connects to anew IP, and when the first user transmits the time zone information ofthe first wireless communication device 100 or the second user transmitsthe time zone information of the second wireless communication device200, the server 300 may receive time zone information from the firstwireless communication device 100 or the second wireless communicationdevice 200.

The server 300 may also receive standard time zone information, currenttime information, and location information of the first wirelesscommunication device 100 or the second wireless communication device 200or receive global positioning system (GPS) information, WiFiinformation, IP information, Bluetooth connection information, and thelike of the first wireless communication device 100 or the secondwireless communication device 200. Based on the received information,the server may receive the time zone information of the first wirelesscommunication device 100 or the second wireless communication device200.

The server 300 may also receive information of another device to whichthe wireless communication device connects. For example, the server 300may receive information of a base station or wireless access point towhich the wireless communication device connects, and determine a timezone of the wireless communication device from the information, such astime zone information of the base station or wireless access point, ofthe device to which the wireless communication device connects. The timezone information of the device to which the wireless communicationdevice connects may be used as the time zone information of the wirelesscommunication device.

In addition, the server 300 may store and manage the received time zoneinformation of the first wireless communication device 100 or the secondwireless communication device 200. When the first wireless communicationdevice 100 requests the time zone information of the second wirelesscommunication device 200, the server 300 may transmit the time zoneinformation of the second wireless communication device 200 to the firstwireless communication device 100. On the other hand, when the secondwireless communication device 200 requests the time zone information ofthe first wireless communication device 100, the server 300 may transmitthe time zone information of the first wireless communication device 100to the second wireless communication device 200.

The server 300 according to an exemplary embodiment may be realized asvarious types. For example, the server 300 may be a mobile communicationnetwork server that provides a mobile communication service or may be asocial networking service (SNS) server that provides an SNS. Thefunction of the server 300 may be performed by the first wirelesscommunication device 100 or the second wireless communication device200. However, exemplary embodiments are not limited thereto. Althoughthe system for providing time zone information of an external wirelesscommunication device includes the first wireless communication device100, the second wireless communication device 200, and the server 300 inFIG. 2, exemplary embodiments are not limited thereto. The system mayinclude more components than those illustrated in FIG. 2 or fewercomponents than those illustrated in FIG. 2.

For example, the system for providing time zone information of anexternal wireless communication device may include only the firstwireless communication device 100 and the second wireless communicationdevice 200 without the server 300. When the system includes only thefirst wireless communication device 100 and the second wirelesscommunication device 200, the first wireless communication device 100may transmit the time zone information of the first wirelesscommunication device 100 to the second wireless communication device200, and the second wireless communication device 200 may transmit thetime zone information of the second wireless communication device 200 tothe first wireless communication device 100.

Alternatively, the first wireless communication device 100 may poll thesecond wireless communication device 200 for time zone informationthereof, either at a predetermined period or upon activation of thewireless communication device 100, and vice versa.

Hereinafter, for convenience of explanation, the second wirelesscommunication device 200 is defined as an opposite wirelesscommunication device, and the first wireless communication device 100 isdefined as a user wireless communication device to or on which time zoneinformation of the opposite wireless communication device is provided ordisplayed.

A method in which the first wireless communication device 100 providestime zone information of the second wireless communication device 200which is located at a different time zone from that of the firstwireless communication device 100 will now be described in detail withreference to FIG. 3.

FIG. 3 is a flowchart of a method of providing time zone information ofthe opposite wireless communication device (i.e., the second wirelesscommunication device 200), according to an exemplary embodiment.

Referring to FIG. 3, the first wireless communication device 100 mayreceive the time zone information of the second wireless communicationdevice 200 related to the first wireless communication device 100, inoperation S310. The first wireless communication device 100 and thesecond wireless communication device 200 being related to each other maymean that identification information of the second wirelesscommunication device 200 is stored in the first wireless communicationdevice 100.

For example, when a telephone number of the second wirelesscommunication device 200 is stored in contact information in the firstwireless communication device 100, it may mean that the first wirelesscommunication device 100 and the second wireless communication device200 are related to each other. If the telephone number of a wirelesscommunication device is stored in contact information, the wirelesscommunication devices may be related if the telephone number is in asubset of contacts, such as a group (i.e., family, friends, etc.) Inaddition, when the telephone number of the second wireless communicationdevice 200 is stored in a call record of the first wirelesscommunication device 100, it may mean that the first wirelesscommunication device 100 and the second wireless communication device200 are related to each other. Alternatively, the wireless communicationdevices may be associated through an application installed on one ormore of the wireless communication devices, such as a text-messagingapplication, photo sharing application, etc., as per below. Theapplication also may refer to an external service, and access contactsor groups of the external service, to relate the wireless communicationdevices together.

The first wireless communication device 100 and the second wirelesscommunication device 200 being related to each other may also mean thatthe first user and the second user belong to the same social group viathe SNSs provided by the first wireless communication device 100 and thesecond wireless communication device 200. For example, when the firstuser and the second user are registered as social friends via SNSsprovided by the first wireless communication device 100 and the secondwireless communication device 200, it may mean that the first wirelesscommunication device 100 and the second wireless communication device200 are related to each other.

The first wireless communication device 100 may receive the time zoneinformation of the second wireless communication device 200 related withthe first wireless communication device 100 from the server 300 orreceive the same directly from the second wireless communication device200.

According to an exemplary embodiment, the time zone information of thesecond wireless communication device 200 may include at least oneselected from standard time zone information (for example, GMT+9 orGMT-2) of the second wireless communication device 200, current timeinformation (for example, 9:00 pm or 10:00 am) of the second wirelesscommunication device 200, and location information (for example, Seoul,New Zealand, Tokyo, New York, or San Francisco) of the second wirelesscommunication device 200.

The time zone information of the second wireless communication device200 may also include mobile communication network connectioninformation, GPS information, WiFi information, IP information,Bluetooth connection information, and the like of the second wirelesscommunication device 200. However, exemplary embodiments are not limitedthereto.

For example, the first wireless communication device 100 may receive,from the server 300, the standard time zone information of the secondwireless communication device 200 or current time information of aregion where the second wireless communication device 200 is located.Alternatively, the first wireless communication device 100 may receivethe location information of the second wireless communication device 200from the server 300 to search for a standard time zone corresponding tothe received location information or current time informationcorresponding to the received location information.

According to an exemplary embodiment, the first wireless communicationdevice 100 may receive by push (or request by poll) the time zoneinformation of the second wireless communication device 200 from theserver 300 at regular intervals, or may receive the time zoneinformation of the second wireless communication device 200 when thefirst wireless communication device 100 requests the time zoneinformation of the second wireless communication device 200.

For example, when the first wireless communication device 100 requeststhe server 300 to update display of time zone information with contactinformation in the first wireless communication device 100 including theidentification information of the second wireless communication device200, the server 300 may transmit the time zone information of the secondwireless communication device 200 to the first wireless communicationdevice 100.

Alternatively, when the time zone information of the second wirelesscommunication device 200 changes or when the server 300 receives thetime zone information of the second wireless communication device 200from the second wireless communication device 200, the server 300 maytransmit the time zone information of the second wireless communicationdevice 200 to the first wireless communication device 100.

In addition, the server 300 may receive the time zone information of thesecond wireless communication device 200 at regular intervals, orreceive the time zone information of the second wireless communicationdevice 200 when the time zone information of the second wirelesscommunication device 200 has changed or when the first wirelesscommunication device 100 requests the time zone information of thesecond wireless communication device 200.

In operation S320, the first wireless communication device 100 maycompare the time zone information of the first wireless communicationdevice 100 with the time zone information of the second wirelesscommunication device 200.

For example, when the first wireless communication device 100 hasreceived information about the standard time zone of the second wirelesscommunication device 200, the first wireless communication device 100may compare a standard time zone of the first wireless communicationdevice 100 with the standard time zone of the second wirelesscommunication device 200 to determine whether the standard time zones ofthe first and second wireless communication devices 100 and 200 areequal to each other. When the standard time zone of the first wirelesscommunication device 100 is GMT+9 and the standard time zone of thesecond wireless communication device 200 is GMT+9, the first wirelesscommunication device 100 may determine that the time zone information ofthe first wireless communication device 100 is identical with the timezone information of the second wireless communication device 200.

In addition, when the first wireless communication device 100 hasreceived the current time information of the second wirelesscommunication device 200, the first wireless communication device 100may compare the current time information of the first wirelesscommunication device 100 with the current time information of the secondwireless communication device 200 to determine whether they are the sameas each other. When the current time information of the first wirelesscommunication device 100 is 9:00 am and the current time information ofthe second wireless communication device 200 is 9:00 am, the firstwireless communication device 100 may determine that the time zoneinformation of the first wireless communication device 100 is identicalwith the time zone information of the second wireless communicationdevice 200.

When the first wireless communication device 100 has received thelocation information of the second wireless communication device 200,the first wireless communication device 100 may compare the locationinformation of the first wireless communication device 100 with thelocation information of the second wireless communication device 200 todetermine whether they are the same as each other. At this time, thefirst wireless communication device 100 may determine whether thelocations of the first wireless communication device 100 and the secondwireless communication device 200 belong to the same standard time zone.

For example, when the first wireless communication device 100 is locatedin Korea and the second wireless communication device 200 is located inJapan, because Korea and Japan belong to the same standard time zone,the time zone information of the first wireless communication device 100and the time zone information of the second wireless communicationdevice 200 may be determined identical although the first wirelesscommunication device 100 and the second wireless communication device200 are located in different geographic regions.

In operation S330, when the time zone information of the second wirelesscommunication device 200 is different from the time zone information ofthe first wireless communication device 100, the first wirelesscommunication device 100 may display the time zone information of thesecond wireless communication device 200.

In this case, the displayed time zone information of the second wirelesscommunication device 200 may include at least one selected from thestandard time zone information of the second wireless communicationdevice 200, the current time information of the second wirelesscommunication device 200, and the location information of the secondwireless communication device 200. Alternatively, a difference or offsetbetween the time zone information of the wireless communication device100 or 200 may be displayed. The first wireless communication device 100may display the time zone information of the second wirelesscommunication device in correspondence to the identification informationof the second wireless communication device 200. For example, the firstwireless communication device 100 may display the time zone informationof the second wireless communication device 200 on a contact informationscreen, a message window, a call screen, an SNS application executionscreen, and the like. However, exemplary embodiments are not limitedthereto.

When the time zone information of the first wireless communicationdevice 100 is different from the time zone information of the secondwireless communication device 200, the first wireless communicationdevice 100 according to an exemplary embodiment may display the timezone information of the second wireless communication device 200 in anarea on the contact information screen that corresponds to the secondwireless communication device 200 while a contact informationapplication is being executed. For example, the contact informationscreen may include the name, nick name, photograph, telephone number,and the like of a user who uses an external wireless communicationdevice. In this case, the first wireless communication device 100 maydisplay the time zone information of the second wireless communicationdevice 200 within or around an area on the contact information screen onwhich the name, nick name, photograph, telephone number, or the like ofthe user of the second wireless communication device 200 is displayed.The operation of the first wireless communication device 100 displayingthe time zone information of the second wireless communication device200 on the contact information screen will be described in detail laterwith reference to FIGS. 8-14D.

When the time zone information of the first wireless communicationdevice 100 is different from the time zone information of the secondwireless communication device 200, the first wireless communicationdevice 100 according to an exemplary embodiment may display the timezone information of the second wireless communication device 200 in amessage window while a message application is being executed. Themessage window may be a text message window, an instant message window,an e-mail window, a chatting window, or the like, but exemplaryembodiments are not limited thereto.

For example, the first wireless communication device 100 may display thetime zone information of the second wireless communication device 200 onat least one selected from a message input region and a message displayregion included in the message window. The message input region may be aregion via which a message desired to be sent is input, and the messagedisplay region may be a region on which a sent or received message isdisplayed. The operation of the first wireless communication device 100displaying the time zone information of the second wirelesscommunication device 200 in the message window will be described indetail later with reference to FIGS. 16-21.

When the time zone information of the first wireless communicationdevice 100 is different from the time zone information of the secondwireless communication device 200, the first wireless communicationdevice 100 according to an exemplary embodiment may display the timezone information of the second wireless communication device 200 on anSNS application execution screen while an SNS application is beingexecuted. For example, the SNS application execution screen may includethe name, nick name, photograph, message, telephone number, and the likeof a user who is connected to the same social group together with theuser of the first wireless communication device 100. In this case, thefirst wireless communication device 100 may display the time zoneinformation of the second wireless communication device 200 within oraround a region on the SNS application execution screen on which thename, nick name, photograph, message, telephone number, or the like ofthe user of the second wireless communication device 200 is displayed.

For example, when the server 300 of FIG. 2 is an SNS server, the SNSserver may receive the time zone information of the second wirelesscommunication device 200 from the second wireless communication device200 and may transmit the received time zone information of the secondwireless communication device 200 to the first wireless communicationdevice 100. Accordingly, the first wireless communication device 100 maycompare the time zone information of the second wireless communicationdevice 200 received from the SNS server with the time zone informationof the first wireless communication device 100. When the time zoneinformation of the second wireless communication device 200 is differentfrom the time zone information of the first wireless communicationdevice 100, the first wireless communication device 100 may display thetime zone information of the second wireless communication device 200 onthe SNS application execution screen. The operation of the firstwireless communication device 100 displaying the time zone informationof the second wireless communication device 200 on the SNS applicationexecution screen will be described in detail later with reference toFIG. 35.

While a call application is being executed, when the time zoneinformation of the first wireless communication device 100 is differentfrom the time zone information of the second wireless communicationdevice 200, the first wireless communication device 100 according to anexemplary embodiment may display the time zone information of the secondwireless communication device 200 on a call screen. For example, whenthe first wireless communication device 100 inputs the identificationinformation of the second wireless communication device 200 (forexample, the name, nickname, telephone number, e-mail address,photograph, shortcut number, or the like of the second user) on a screenbefore a call is connected, the first wireless communication device 100may display the time zone information of the second wirelesscommunication device 200 on the screen before a call is connected.

When the first wireless communication device 100 requests a callconnection to the second wireless communication device 200, the firstwireless communication device 100 may display the time zone informationof the second wireless communication device 200 on a call connectionrequest screen. When the first wireless communication device 100receives a call connection request from the second wirelesscommunication device 200, the first wireless communication device 100may display the time zone information of the second wirelesscommunication device 200 on a call-receiving screen. The operation ofthe first wireless communication device 100 displaying the time zoneinformation of the second wireless communication device 200 on the callscreen will be described in detail later with reference to FIGS. 26-30B.

FIG. 4 is a flowchart of a method in which the first wirelesscommunication device 100 receives the time zone information of thesecond wireless communication device 200, according to an exemplaryembodiment.

Referring to FIG. 4, the second wireless communication device 200 maytransmit the time zone information of the second wireless communicationdevice 200 to the server 300, in operation S410. In this case, thesecond wireless communication device 200 may transmit the time zoneinformation of the second wireless communication device 200 to theserver 300 at regular intervals. Alternatively, when the time zoneinformation of the second wireless communication device 200 changes, thesecond wireless communication device 200 may transmit the time zoneinformation of the second wireless communication device 200 to theserver 300.

For example, when the second wireless communication device 200 has beenmoved a predetermined distance or more, the second wirelesscommunication device 200 may sense that the time zone of the secondwireless communication device 200 has changed. The second wirelesscommunication device 200 may sense the location of the second wirelesscommunication device 200 by using a position sensor (for example, a GPSmodule). When the location of the second wireless communication device200 has changed the predetermined distance or more, the second wirelesscommunication device 200 may sense that the time zone thereof haschanged. The second wireless communication device 200 may sense that thetime zone thereof has changed, by comparing the standard time zonecorresponding to the previous location of the second wirelesscommunication device 200 with the standard time zone corresponding tothe current location thereof.

In addition, when the second wireless communication device 200 is turnedon, when the second wireless communication device 200 connects to a newbase station, and when the second wireless communication device 200connects to a new IP, the second wireless communication device 200 maytransmit the time zone information of the second wireless communicationdevice 200 to the server 300.

The second wireless communication device 200 may transmit the standardtime zone information, the current time information, the locationinformation, and the like of the second wireless communication device200 to the server 300. When the time zone of the second wirelesscommunication device 200 has changed, the second wireless communicationdevice 200 may transmit changed standard time zone information, changedcurrent time information, changed location information, and the likethereof to the server 300.

The server 300 may store the received time zone information of thesecond wireless communication device 200 and compare pre-stored timezone information of the second wireless communication device 200 withthe received time zone information of the second wireless communicationdevice 200. When it is determined as a result of the comparison that thetime zone information of the second wireless communication device 200has changed, the server 300 may update and store the time zoneinformation of the second wireless communication device 200.

In operation S420, the server 300 receives a request for the time zoneinformation of the second wireless communication device 200 from thefirst wireless communication device 100. In this case, the server 300may transmit the time zone information of the second wirelesscommunication device 200 to the first wireless communication device 100,in operation S430.

For example, when the first wireless communication device 100 executes acontact information application, when the first wireless communicationdevice 100 requests the server 300 to update time zone information ofthe second wireless communication device 200 displayed with contactinformation in the first wireless communication device 100, when thefirst wireless communication device 100 inputs the identificationinformation of the second wireless communication device 200 (forexample, the name, nick name, telephone number, e-mail address,photograph, or shortcut number of the second user) in order to call thesecond wireless communication device 200 or send a message to the secondwireless communication device 200, or when the first wirelesscommunication device 100 requests a call connection to the secondwireless communication device 200, the first wireless communicationdevice 100 may request the server 300 for the time zone information ofthe second wireless communication device 200. However, exemplaryembodiments are not limited thereto.

Accordingly, the server 300 may transmit the standard time zoneinformation, the current time information, the location information, andthe like of the second wireless communication device 200 to the firstwireless communication device 100.

FIG. 5 is a flowchart of a method in which the first wirelesscommunication device 100 receives the time zone information of thesecond wireless communication device 200, according to an exemplaryembodiment.

Referring to FIG. 5, the second wireless communication device 200 maytransmit the time zone information of the second wireless communicationdevice 200 to the server 300, in operation S510. Because operation S510of FIG. 5 corresponds to operation S410 of FIG. 4, a repeateddescription thereof will be omitted.

In operation S520, the server 300 may determine whether the receivedtime zone information of the second wireless communication device 200has changed.

The server 300 may store the received time zone information of thesecond wireless communication device 200 and compare pre-stored timezone information of the second wireless communication device 200 withthe received time zone information of the second wireless communicationdevice 200 to determine whether the time zone information of the secondwireless communication device 200 has changed.

If it is determined that the time zone information of the secondwireless communication device 200 has changed, the server 300 may searchfor the first wireless communication device 100 related with the secondwireless communication device 200, in operation S530. Examples of thefirst wireless communication device 100 related with the second wirelesscommunication device 200 may include an external wireless communicationdevice corresponding to identification information stored in contactinformation in the second wireless communication device 200, an externalwireless communication device corresponding to identificationinformation remaining in a call record in the second wirelesscommunication device 200, and a wireless communication device of a userwho belongs to the same social group together with the second user(i.e., the user of the second wireless communication device 200) via anSNS.

Accordingly, in operation S540, the server 300 may transmit changed timezone information of the second wireless communication device 200 to thefound first wireless communication device 100. For example, the server300 may transmit changed standard time zone information, changed currenttime information, changed location information, and the like of thesecond wireless communication device 200 to the first wirelesscommunication device 100.

Accordingly, when the time zone information of the second wirelesscommunication device 200 has changed, the first wireless communicationdevice 100 related with the second wireless communication device 200 mayautomatically receive the changed time zone information of the secondwireless communication device 200 from the server 300.

FIG. 6 is a flowchart of a method in which related wirelesscommunication devices receive time zone information of opposite wirelesscommunication devices from the opposite wireless communication devices,according to an exemplary embodiment; Hereinafter, for convenience ofexplanation, the first wireless communication device 100 and the secondwireless communication device 200 are referred to as related wirelesscommunication devices.

Referring to FIG. 6, the first wireless communication device 100 and thesecond wireless communication device 200 may respectively transmit theirown time zone information to the server 300, in operations S610 andS620. In this case, the first wireless communication device and thesecond wireless communication device 200 may respectively transmit theirown time zone information to the server 300 at regular intervals.Alternatively, when the time zone information of the first wirelesscommunication device 100 changes, the first wireless communicationdevice 100 may transmit the time zone information of the first wirelesscommunication device 100 to the server 300. When the time zoneinformation of the second wireless communication device 200 changes, thesecond wireless communication device 200 may transmit the time zoneinformation of the second wireless communication device to the server300. For example, the first wireless communication device 100 and thesecond wireless communication device 200 may sense changes in thelocations thereof by using a position sensor or the like.

The first wireless communication device 100 may transmit standard timezone information, current time information, location information, andthe like of the first wireless communication device 100 to the server300, and the second wireless communication device 200 may transmit thestandard time zone information, the current time information, thelocation information, and the like of the second wireless communicationdevice 200 to the server 300.

The server 300 may store the received time zone information of the firstwireless communication device 100 and the received time zone informationof the second wireless communication device 200 and compare pre-storedtime zone information of the first wireless communication device 100with the received time zone information of the first wirelesscommunication device 100. When it is determined as a result of thecomparison that the time zone information of the first wirelesscommunication device 100 has changed, the server 300 may update andstore the time zone information of the first wireless communicationdevice 100. Similarly, when the time zone information of the secondwireless communication device 200 has changed, the server 300 may updateand store the time zone information of the second wireless communicationdevice 200.

In operation S630, the server 300 may search for related wirelesscommunication devices. The server 300 may search for the second wirelesscommunication device 200 corresponding to identification informationstored in the first wireless communication device 100 and may search fora wireless communication device of the second user who is included inthe same social group together with the first wireless communicationdevice 100 or the first user (i.e., the user of the first wirelesscommunication device 100). For example, the server 300 may search for awireless communication device of a second user of which telephone numberhas been registered in the contact information in the first wirelesscommunication device 100 or a wireless communication device of a seconduser who has been registered as a social friend of the first user.

In operation S640, the server 300 may determine whether the time zoneinformation of the found second wireless communication device 200 isdifferent from that of the first wireless communication device 100, bycomparing the time zone information of the found second wirelesscommunication device 200 with that of the first wireless communicationdevice 100.

For example, when the server 300 has received information about thestandard time zones of the first wireless communication device 100 andthe second wireless communication device 200, the server may determinewhether the standard time zone of the first wireless communicationdevice 100 is different from that of the second wireless communicationdevice 200, by comparing them with each other. When the server 300 hasreceived the current time information of the first wirelesscommunication device 100 and the current time information of the secondwireless communication device 200, the server 300 may determine whetherthe current time information of the first wireless communication device100 is different from that of the second wireless communication device200, by comparing them with each other. When the server 300 has receivedthe location information of the first wireless communication device 100and the location information of the second wireless communication device200, the server 300 may determine whether the first wirelesscommunication device 100 and the second wireless communication device200 are located in the same standard time zone.

When the time zone information of the first wireless communicationdevice 100 and the time zone information of the second wirelesscommunication device 200 received by the server 300 are of differenttypes, the server 300 may change the type of one of the time zoneinformation of the first wireless communication device 100 and the timezone information of the second wireless communication device 200 to thetype of the other time zone information and then may compare a result ofthe type change with the other time zone information.

For example, when the server 300 receives the standard time zoneinformation of the first wireless communication device 100 and thecurrent time information of the second wireless communication device200, the server 300 may compare current time information of the firstwireless communication device 100 calculated based on the standard timezone information of the first wireless communication device 100 with thecurrent time information of the second wireless communication device200. Alternatively, the server 300 may calculate standard time zoneinformation of the second wireless communication device 200 based on thecurrent time information of the second wireless communication device 200and then compare the calculated standard time zone information of thesecond wireless communication device 200 with the standard time zoneinformation of the first wireless communication device 100.

When it is determined in operation S640 that the time zone informationof the first wireless communication device 100 is different from thetime zone information of the second wireless communication device 200,the server 300 may transmit the time zone information of the secondwireless communication device 200 to the first wireless communicationdevice 100, in operation S650, and may transmit the time zoneinformation of the first wireless communication device 100 to the secondwireless communication device 200, in operation S660.

Accordingly, when the time zone information of the first wirelesscommunication device 100 is different from the time zone information ofthe second wireless communication device 200, the first wirelesscommunication device 100 and the second wireless communication device200 related with the first wireless communication device 100 mayautomatically receive the different time zone information of oppositewireless communication devices thereof from the server 300.

FIG. 7 is a flowchart of a method in which related wirelesscommunication devices receive time zone information displayed on contactinformation in the related wireless communication devices in a batchmanner, according to an exemplary embodiment.

Referring to FIG. 7, the server 300 may be requested by the firstwireless communication device 100 and the second wireless communicationdevice 200 to update time zone information displayed on contactinformation in the first and second wireless communication devices 100and 200 at a first batch time, respectively, in operations S710 andS715. A batch time may be the time during which the server 300batch-processes updating of the contact information in wirelesscommunication devices.

In operation S720, the server 300 may check the contact information inthe first wireless communication device 100 and the contact informationin the second wireless communication device 200 to determine whether anychange exists. For example, the server 300 may search for a change in oran update on the contact information in the first wireless communicationdevice 100 or the contact information in the second wirelesscommunication device 200 before the first batch time.

When any change in or any update on the contact information in the firstwireless communication device 100 before the first batch time is notfound, the server 300 may not transmit update information for updatingthe contact information in the first wireless communication device 100to the first wireless communication device 100. When any change in orany update on the contact information in the second wirelesscommunication device 200 before the first batch time is not found, theserver 300 may not transmit update information for updating the contactinformation in the second wireless communication device 200 to thesecond wireless communication device 200.

On the other hand, the second wireless communication device 200 maysense a change in the time zone of the second wireless communicationdevice 200, in operation S730. In operation S740, the second wirelesscommunication device 200 may transmit changed time zone information ofthe second wireless communication device 200 to the server 300.

In operations S750 and S755, the server 300 may receive contactinformation update requests from the first wireless communication device100 and the second wireless communication device 200 at a second batchtime, respectively.

In operation S760, the server 300 may check the contact information inthe first wireless communication device 100 and the contact informationin the second wireless communication device 200 to determine whether anychange exists. For example, the server 300 may search for a change in oran update on the contact information in the first wireless communicationdevice 100 or the contact information in the second wirelesscommunication device 200 before the second batch time.

In this case, the server 300 may ascertain that the time zoneinformation of the second wireless communication device 200 included inthe contact information in the first wireless communication device 100has been updated before the second batch time.

Accordingly, the server 300 may transmit the time zone information ofthe second wireless communication device 200 to the first wirelesscommunication device 100, in operation S770. For example, because thetime zone information of the second wireless communication device 200included in the contact information in the first wireless communicationdevice 100 has been updated before the second batch time, the server 300may transmit update information including the time zone information ofthe second wireless communication device 200 to the first wirelesscommunication device 100.

On the other hand, because any change in or any update on the contactinformation of the second wireless communication device 200 before thesecond batch time is not found, the server 300 may not transmit updateinformation for updating the contact information in the second wirelesscommunication device 200 to the second wireless communication device200.

FIG. 8 is a flowchart of a method of displaying the time zoneinformation of the second wireless communication device 200 on thecontact information in the first wireless communication device 100,according to an exemplary embodiment.

Referring to FIG. 8, the first wireless communication device 100 mayexecute a contact information application, in operation S810. Forexample, the first wireless communication device 100 may execute thecontact information application in response to a request from a user toexecute the contact information application.

In operation S820, the first wireless communication device 100 mayreceive the time zone information of the second wireless communicationdevice 200 included in the contact information in the first wirelesscommunication device 100. For example, the first wireless communicationdevice 100 may receive the time zone information of the second wirelesscommunication device 200 included in the contact information in thefirst wireless communication device 100 from the server 300 byrequesting the server 300 for the time zone information of the secondwireless communication device 200. In this case, the first wirelesscommunication device 100 may request time zone information of allwireless communication devices included in the contact informationtherein, or may select at least one of the wireless communicationdevices included in the contact information therein and request timezone information of the at least one selected wireless communicationdevice.

In operation S830, the first wireless communication device 100 maydetermine whether the received time zone information of the secondwireless communication device 200 is different from the time zoneinformation of the first wireless communication device 100.

When it is determined that the received time zone information of thesecond wireless communication device 200 is different from the time zoneinformation of the first wireless communication device 100, the firstwireless communication device 100 may display the time zone informationof the second wireless communication device 200 on the contactinformation in the first wireless communication device 100, in operationS840. For example, the first wireless communication device 100 maydisplay the time zone information of the second wireless communicationdevice 200 around the identification information of the second wirelesscommunication device 200 (for example, the name, nickname, telephonenumber, e-mail address, photograph, shortcut number, or the like of thesecond user) included in a contact information screen of the firstwireless communication device 100. The time zone information of thesecond wireless communication device 200 may be expressed as standardtime zone information, current time information, location information,or the like, but is not limited thereto. The time zone information ofthe second wireless communication device 200 may be expressed in variousways. This will be described in greater detail later with reference toFIGS. 14A-14D.

As described above, the time zone information of the second wirelesscommunication device 200 located at a different time zone from that ofthe first wireless communication device 100 may be displayed on thecontact information screen of the first wireless communication device100 so that the user of the first wireless communication device 100 maycheck the time zone information of the user of the second wirelesscommunication device 200 before making a call or sending a message tothe user of the second wireless communication device 200 and thus maydetermine whether to make a call or send a message to the user of thesecond wireless communication device 200. Alternatively, the wirelesscommunication device 100 may check the time zone information upon launchof an application that refers to the time zone information.

FIG. 9 is a flowchart of a method of updating and displaying time zoneinformation while a contact information application is being executed,according to an exemplary embodiment.

Referring to FIG. 9, the second wireless communication device 200 maytransmit the time zone information of the second wireless communicationdevice 200 to the server 300, in operation S910. Because operation S910of FIG. 9 corresponds to operation S410 of FIG. 4, a repeateddescription thereof will be omitted.

In operation S920, the server 300 may compare pre-stored time zoneinformation of the second wireless communication device 200 with thereceived time zone information of the second wireless communicationdevice 200, and may update and store the time zone information of thesecond wireless communication device 200 when it is determined as aresult of the comparison that the time zone information of the secondwireless communication device 200 has changed.

In operation S930, the first wireless communication device 100 mayexecute a contact information application based on a user input. Inoperation S940, the first wireless communication device 100 may requestthe server 300 to update the time zone information displayed on thecontact information in the first wireless communication device 100. Thefirst wireless communication device 100 according to an exemplaryembodiment may automatically transmit a time zone information updaterequest to the server 300 when the contact information application isexecuted. Alternatively, when the contact information application isexecuted, the first wireless communication device 100 may transmit thetime zone information update request to the server 300, based on a userinput. This will now be described in greater detail with reference toFIGS. 10A and 10B.

FIGS. 10A and 10B illustrate a contact information application executionscreen (i.e., a contact information screen). Referring to FIGS. 10A and10B, the contact information screen may include a list of users whosecontact information is stored. The first wireless communication device100 may display an update request icon 1010 together with the list onthe contact information screen.

For example, in the case of FIG. 10A, when the first wirelesscommunication device 100 displays only one update request icon 1010 andthe update request icon 1010 is selected, the first wirelesscommunication device 100 may request the server 300 to update the timezone information of wireless communication devices corresponding to allwireless communication devices stored in the contact information in thefirst wireless communication device 100.

On the other hand, in the case of FIG. 10B, when the first wirelesscommunication device 100 displays an update request icon 1010 for eachof the users listed on the contact information and at least one of theupdate request icons 1010 is selected, the first wireless communicationdevice 100 may request the server 300 to update the time zoneinformation of a user wireless communication device corresponding to theselected icon.

Alternatively, although not shown, when no icons are displayed and auser is selected from the list of users stored on the contactinformation, the first wireless communication device 100 may request theserver 300 to update the time zone information of a wirelesscommunication device of the selected user.

The above-described embodiments are only examples, and the firstwireless communication device 100 may transmit the time zone informationupdate request to the server 300 based on various other user inputs. Asdiscussed above, however, the wireless communication device 100 mayautomatically update time zone information without user input, forexample based on an application setting or by software design.

Referring back to FIG. 9, in operation S950, the server 300 may checkthe time zone information of the second wireless communication device200 displayed with the contact information in the first wirelesscommunication device 100, in response to the time zone informationupdate request from the first wireless communication device 100. Forexample, when the first wireless communication device 100 requests timezone information of all users stored in the contact information thereinor requests the time zone information of the user of the second wirelesscommunication device 200, the server 300 may determine whether the timezone information of the second wireless communication device 200 haschanged.

For example, the server may compare time zone information of the secondwireless communication device 200 included in the contact information inthe first wireless communication device 100 with time zone informationof the second wireless communication device 200 pre-stored in the server300 to thereby determine whether the time zone information of the secondwireless communication device 200 included in the contact information inthe first wireless communication device 100 has changed.

When the time zone information of the second wireless communicationdevice 200 included in the contact information in the first wirelesscommunication device 100 has changed, the server 300 may transmitchanged time zone information of the second wireless communicationdevice 200 to the first wireless communication device 100, in operationS960. On the other hand, when the time zone information of the secondwireless communication device 200 included in the contact information inthe first wireless communication device 100 has not changed, the server300 may not transmit the time zone information of the second wirelesscommunication device 200 to the first wireless communication device 100.

In operation S970, the first wireless communication device 100 mayreceive the changed time zone information of the second wirelesscommunication device 200 from the server 300 and display the changedtime zone information of the second wireless communication device 200 onthe contact information screen. A method of displaying the time zoneinformation of the second wireless communication device 200 will bedescribed later in detail with reference to FIGS. 14A-14D.

FIGS. 11A-14D illustrate an example in which time zone information of asecond wireless communication device is displayed on the contactinformation in the first wireless communication device 100.

FIGS. 11A and 11B illustrate an example of a contact information screenthat is displayed according to whether the time zone information of thesecond wireless communication device is equal to or different from thetime zone information of the first wireless communication device 100.

As illustrated in FIG. 11A, when a contact information application isexecuted, the first wireless communication device 100 may display acontact information screen including a list of contact informationstored in the contact information in the first wireless communicationdevice 100. The displayed contact information screen may include anupdate request icon 1110 for updating time zone informationcorresponding to the contact information listed in the contactinformation in the first wireless communication device 100.

When the user of the first wireless communication device 100 (i.e., thefirst user) selects the update request icon 1110, the first wirelesscommunication device 100 may receive time zone information of wirelesscommunication devices corresponding to the listed contact information.As illustrated in FIG. 11B, the first wireless communication device 100may divide the wireless communication devices corresponding to the ofcontact information (i.e., second wireless communication devices) intowireless communication devices 1120 of which time zone information isequal to that of the first wireless communication device 100 andwireless communication devices 1130 of which time zone information isdifferent from that of the first wireless communication device 100, anddisplay the wireless communication devices 1120 and 1130.

The first wireless communication device 100 may also display time zoneinformation 1140 of each wireless communication device of which timezone information is different from that of the first wirelesscommunication device 100.

Alternatively, the wireless communication devices may be displayedaccording to an order of time zone information. For example, wirelesscommunication devices may be displayed according to an increasing ordecreasing offset from the time zone information of the wirelesscommunication device 100, or from a base time zone, such as Greenwichmean time.

Accordingly, the first user may easily ascertain wireless communicationdevices having the same time zone information as that of the firstwireless communication device 100 and wireless communication deviceshaving different time zone information from that of the first wirelesscommunication device 100.

FIGS. 12A and 12B illustrate an example of a contact information screenthat is displayed according to whether the time zone information of asecond wireless communication device is made accessible.

As illustrated in FIG. 12A, when the contact information application isexecuted, the first wireless communication device 100 may display acontact information screen including a contact information list ofcontact information stored in the contact information in the firstwireless communication device 100. The displayed contact informationscreen may include an update request icon 1210 for updating time zoneinformation corresponding to the contact information listed in thecontact information in the first wireless communication device 100.

When the user of the first wireless communication device 100 (i.e., thefirst user) selects the update request icon 1210, the first wirelesscommunication device 100 may receive time zone information of wirelesscommunication devices corresponding to the listed contact information.As illustrated in FIG. 12B, the first wireless communication device 100may divide the wireless communication devices corresponding to thelisted contact information into wireless communication devices 1220 ofwhich time zone information is made accessible and wirelesscommunication devices 1230 of which time zone information is madeinaccessible, and display the wireless communication devices 1220 and1230.

When the time zone information of a wireless communication device thatis made accessible is different from that of the first wirelesscommunication device 100, time zone information 1240 corresponding tothe time zone information of the wireless communication device that ismade accessible may be displayed.

Accordingly, the first user may easily ascertain wireless communicationdevices of which time zone information is made accessible and wirelesscommunication devices of which time zone information is madeinaccessible.

FIGS. 13A and 13B illustrate an example of a screen that is displayedwhen a second wireless communication device sets time zone informationthereof to be inaccessible.

As illustrated in FIG. 13A, when the contact information application isexecuted, the first wireless communication device 100 may display acontact information screen including a contact information list ofcontact information stored in the contact information in the firstwireless communication device 100. The displayed contact informationscreen may include time zone information update request icons 1310 and1315 respectively corresponding to contact information listed in thecontact information in the first wireless communication device 100.

In this case, when one is selected from a plurality of time zoneinformation update request icons, the first wireless communicationdevice 100 may receive the time zone information of a user wirelesscommunication device corresponding to the selected time zone informationupdate request icon. For example, when the time zone information updaterequest icon 1310, corresponding to contact information referred to as‘Adam’, is selected, the first wireless communication device 100 mayreceive the time zone information of a wireless communication device ofa user ‘Adam’ from the server 300.

When the time zone information of a user wireless communication devicecorresponding to a selected time zone information update request icon isset to be inaccessible, the first wireless communication device 100 maydisplay a message indicating that the time information of the userwireless communication device corresponding to the selected time zoneinformation update request icon cannot be received.

For example, when the time zone information update request icon 1315,corresponding to contact information referred to as ‘Batman’, isselected and a user ‘Batman’ sets the time zone information of his orher wireless communication device to be inaccessible, a message 1320saying ‘I cannot receive time information of Batman’ may be displayed,as illustrated in FIG. 13B.

FIGS. 14A-14D illustrate an example in which the time zone informationof a second wireless communication device is displayed on the contactinformation screen of the first wireless communication device 100.

The first wireless communication device 100 may display, on the contactinformation screen of the first wireless communication device 100, thetime zone information of the second wireless communication device 200located at a different time zone from that of the first wirelesscommunication device 100.

For example, as illustrated in FIG. 14A, the first wirelesscommunication device 100 may display current time information 1410 (forexample, 16:01) of the second wireless communication device 200 in anarea on the contact information screen on which the name of a user (forexample, Claire) of the second wireless communication device 200 isdisplayed. Accordingly, the user of the first wireless communicationdevice 100 may ascertain the current time information of a place wherethe second wireless communication device 200 of the second user islocated.

Alternatively, as illustrated in FIG. 14B, the first wirelesscommunication device 100 may display information 1420 including bothlocation information, for example, ‘New York’ of the second wirelesscommunication device 200 and current time information, for example,16:01, of the second wireless communication device 200, within an areaon the contact information screen on which the name of a user (forexample, Claire) of the second wireless communication device 200 isdisplayed.

Accordingly, the user of the first wireless communication device 100 mayascertain both the location of a wireless communication device of asecond user (for example, Claire) and the current time information of aplace where the wireless communication device of the second user islocated.

Alternatively, as illustrated in FIGS. 14C and 14D, the first wirelesscommunication device 100 may display a brief information icon indicatingthe time zone information of the second wireless communication device200 or a brief information icon indicating whether the user of thesecond wireless communication device 200 is available for a call.

For example, the first wireless communication device 100 may displaybrief information icons 1431 and 1432 briefly indicating the time zoneinformation of the second wireless communication device 200 within anarea on the contact information screen on which the name of a user (forexample, Claire or Cat) of the second wireless communication device 200is displayed. The brief information icons 1431 and 1432 may be iconsfrom which it is only checked whether the time of a region where thesecond wireless communication device 200 is located is a.m./p.m. or themorning/afternoon/night.

For example, as illustrated in FIG. 14C, the first wirelesscommunication device 100 may display a brief information icon 1431 onwhich a Sun is displayed, in an area on the contact information screenon which the name of a user (for example, Claire) of the second wirelesscommunication device 200 is displayed. The brief information icon 1431on which a Sun is displayed may indicate that the second wirelesscommunication device 200 is located in a region where it is daytime.

The first wireless communication device 100 may also display a briefinformation icon 1432 on which a Moon is displayed, in an area on thecontact information screen on which the name of a user (for example,Cat) of a third wireless communication device is displayed. The briefinformation icon 1432 on which a Moon is displayed may indicate that thethird wireless communication device is located in a region where it isnighttime.

Alternatively, the first wireless communication device 100 may displayicons 1441 and 1442 indicating whether a user of the second wirelesscommunication device 200 (for example, Claire or Cat) is available for acall, within an area on the contact information screen on which the nameof the user (for example, Claire or Cat) of the second wirelesscommunication device 200 is displayed.

For example, as illustrated in FIG. 14D, when the user of the secondwireless communication device 200 (for example, Claire) is available fora call, the icon 1441 may have an image indicating that a user isavailable for a call. When the user of the third wireless communicationdevice (for example, Cat) is not available for a call, the icon 1442 mayhave an image indicating that a user is not available for a call.

Accordingly, when the user of the second wireless communication device200 does not want to make detailed time information or locationinformation thereof accessible, the time zone information of the secondwireless communication device 200 or whether the second user isavailable for a call may be indicated by the brief information icons1431, 1432, 1441, and 1442 as described above so that the privacy andpersonal information of the user of the second wireless communicationdevice 200 may be protected.

What type of information is used as the time zone information of thesecond wireless communication device 200 displayed on the first wirelesscommunication device 100 may be set by the first wireless communicationdevice 100 or the second wireless communication device 200. For example,when the first wireless communication device 100 sets the time zoneinformation of the second wireless communication device 200 to bedisplayed as current time information, the first wireless communicationdevice 100 may display the time zone information of the second wirelesscommunication device 200 as current time information. When the secondwireless communication device 200 sets the time zone information thereofto be displayed as brief information, the first wireless communicationdevice 100 may display the time zone information of the second wirelesscommunication device 200 as brief information.

The first wireless communication device 100 according to an exemplaryembodiment provides a contact information screen on which time zoneinformation of a second wireless communication device located at adifferent time zone from that of the first wireless communication device100 is displayed, in order to easily ascertain the second wirelesscommunication device and prevent a call from being made to the user ofthe second wireless communication device 200 in a time zone when theuser of the second wireless communication device 200 is hard to receivea call.

FIG. 15 illustrates an example in which the time zone information of asecond wireless communication device is displayed in a contactinformation detailed information provision screen of the first wirelesscommunication device 100.

As illustrated in FIG. 15, the first wireless communication device 100according to an exemplary embodiment may display the time zoneinformation of a friend located at a different time zone from that ofthe first wireless communication device 100, in an area on the contactinformation in the first wireless communication device 100 that providesdetailed information about the friend.

For example, when the first user selects the second user from amongusers listed on contact information in the first wireless communicationdevice 100, the first wireless communication device 100 may display adetailed information screen including detailed information about thesecond user. The detailed information screen may include theidentification information of the second wireless communication device(for example, the name, nickname, telephone number, e-mail address,photograph, shortcut number, and the like of the second user).

The first wireless communication device 100 may display time zoneinformation 1510 of the second user on the detailed information screenincluding the detailed information about the second user.

According to an exemplary embodiment, the first user may easilyascertain second users located at different time zones from that of thefirst user, from the detailed information screen of the contactinformation in the first user. Thus, calling the second user when thesecond user is unable to receive a call may be prevented.

FIG. 16 is a flowchart of a method of displaying the time zoneinformation of the second wireless communication device 200 in a messagewindow of the first wireless communication device 100, according to anexemplary embodiment.

Referring to FIG. 16, the first wireless communication device 100 mayexecute a message application, in operation S1610.

When the message application is executed, the first wirelesscommunication device 100 may receive the identification information ofthe second wireless communication device 200 which is to receive amessage, in operation S1620.

For example, when the user of the first wireless communication device100 (i.e., the first user) intends to transmit a message to the user ofthe second wireless communication device 200 (i.e., the second user),the first user may directly input identification information of thesecond wireless communication device 200 (for example, the name, nickname, telephone number, e-mail address, photograph, or shortcut numberof the second user) to the message window or may select identificationinformation of the second wireless communication device 200 from a list(for example, contact information in the first wireless communicationdevice 100) including pieces of identification information of the secondwireless communication device 200.

In operation S1630, the first wireless communication device 100 mayreceive the time zone information of the second wireless communicationdevice 200 based on the identification information of the secondwireless communication device 200.

For example, the first wireless communication device 100 may extract thetime zone information of the second wireless communication device 200included in the contact information in the first wireless communicationdevice 100, by using the identification information of the secondwireless communication device 200. Alternatively, the first wirelesscommunication device 100 may transmit the identification information ofthe second wireless communication device 200 to the server 300, requestthe server 300 for the time zone information of the second wirelesscommunication device 200, and receive the time zone information of thesecond wireless communication device 200 from the server 300.

In operation S1640, the first wireless communication device 100 maydetermine whether the received time zone information of the secondwireless communication device 200 is different from the time zoneinformation of the first wireless communication device 100.

For example, the first wireless communication device 100 may compare thestandard time zone information, the current time information, thelocation information, or the like of the first wireless communicationdevice 100 with the standard time zone information, the current timeinformation, the location information, or the like of the secondwireless communication device 200 to determine whether the time zoneinformation of the second wireless communication device 200 is differentfrom the time zone information of the first wireless communicationdevice 100.

When it is determined that the received time zone information of thesecond wireless communication device 200 is different from the time zoneinformation of the first wireless communication device 100, the firstwireless communication device 100 may display the time zone informationof the second wireless communication device 200 in the message window,in operation S1650.

For example, the first wireless communication device 100 may display thetime zone information of the second wireless communication device 200based on at least one selected from a message input region and a messagedisplay region included in the message window. The message input regionmay be a region via which a message desired to be sent is input, and themessage display region may be a region on which a sent or receivedmessage is displayed.

The first wireless communication device 100 according to an exemplaryembodiment displays the time zone information of the second wirelesscommunication device 200 before the user of the first wirelesscommunication device 100 sends a message to the user of the secondwireless communication device 200, whereby the first user may ascertainin advance whether the second user is able to receive the message.

FIGS. 17A, 17B, and 18 illustrate an example in which the time zoneinformation of the second wireless communication device 200 is displayedin the message window of the first wireless communication device 100,according to an exemplary embodiment.

As illustrated in FIG. 17A, the user of the first wireless communicationdevice 100 may select the identification information of the secondwireless communication device 200 which is to receive a message. Forexample, the name of the user of the second wireless communicationdevice 200 (for example, Claire) may be selected from the contactinformation list stored in the first wireless communication device 100.

When the name of the user of the second wireless communication device200, i.e., Claire, is selected, the first wireless communication device100 may display a message window 1710 for performing message exchangewith the second user. The first wireless communication device 100 mayrequest the server 300 for the time zone information of the secondwireless communication device 200 and receive the time zone informationof the second wireless communication device 200 from the server 300,based on the selected name of the user of the second wirelesscommunication device 200. Alternatively, the first wirelesscommunication device 100 may extract the time zone information of thesecond wireless communication device 200 stored in the contactinformation in the first wireless communication device 100.

When the time zone information of the second wireless communicationdevice 200 is different from the time zone information of the firstwireless communication device 100, as illustrated in FIG. 17B, the firstwireless communication device 100 may display time zone information 1720of the second wireless communication device 200 below an area on themessage window 1710 on which the name of the second user is displayed.The time zone information of the second wireless communication device200 may be the standard time zone information, the current timeinformation, the location information, or the like of the secondwireless communication device 200, but is not limited thereto.

Alternatively, as illustrated in FIG. 18, the time zone information ofthe second wireless communication device 200 received from the server300 or extracted from the contact information may be displayed on aplurality of areas on the message window 1710. For example, the firstwireless communication device 100 may display a data included in thetime zone information of the second wireless communication device 200(for example, October 22) and the location information (for example, NewYork) thereof below the area on which the name of the second user isdisplayed, and may display a current time 1810 (for example, 17:01)included in the time zone information in a message input region.

As such, the first wireless communication device 100 displays the timezone information of the second wireless communication device 200 in themessage window so that the user of the first wireless communicationdevice 100 may check the time zone information of the second wirelesscommunication device 200 before sending a message to the user of thesecond wireless communication device 200, whereby the user of the firstwireless communication device 100 may ascertain in advance whether theuser of the second wireless communication device 200 is able to receivethe message.

FIGS. 19A and 19B illustrate an example of displaying the time zoneinformation of the second wireless communication device 200 in themessage window of the first wireless communication device 100, accordingto an exemplary embodiment.

In FIGS. 19A and 19B, a case where the user of the first wirelesscommunication device 100 (i.e., the first user) transmits a message tothe user of the second wireless communication device 200 (i.e., thesecond user, for example, Claire) located at a different time zone fromthat of the first wireless communication device 100 is illustrated.

As illustrated in FIG. 19A, the first user may transmit a first message1920 saying “Hello˜” to the second user. The first message 1920 may bedisplayed in a message display region 1910, together with a firstmessage sent time.

As illustrated in FIG. 19A, the first wireless communication device 100according to an exemplary embodiment may display the time when the firstmessage 1920 is sent, based on the time zone of the second wirelesscommunication device 200. The first wireless communication device 100may display the standard time zone information, the current timeinformation, the location information, brief information, and the likeof the second wireless communication device 200 in the first message1920.

For example, when the time when the first user sent the first message1920 is ‘08:48’ (i.e., a first message sent time based on the time zoneinformation of the first wireless communication device 100) and a firstmessage sent time based on the time zone information of the secondwireless communication device 200 is ‘15:48’, the first wirelesscommunication device 100 may display ‘15:48’ in the first message 1920.

Alternatively, as illustrated in FIG. 19B, the first wirelesscommunication device 100 may display both a message sent time based onthe time zone information of the first wireless communication device 100and a message sent time based on the time zone information of the secondwireless communication device 200.

For example, the first wireless communication device 100 may displayboth ‘08:48’ (i.e., the first message sent time based on the time zoneinformation of the first wireless communication device 100) and ‘15:48’(i.e., the first message sent time based on the time zone information ofthe second wireless communication device 200) in a first message 1930.The first wireless communication device 100 may display a message senttime and message received time based on the first wireless communicationdevice 100 and a message sent time and message received time based onthe second wireless communication device 200 in different colors so thatthey may be distinguished from each other.

FIG. 20 illustrates a message window displayed on the first wirelesscommunication device 100 during message exchange between the first andsecond wireless communication devices 100 and 200, according to anexemplary embodiment.

As illustrated in FIG. 20, the first wireless communication device 100may display time zones at which a plurality of messages were sent orreceived, within a plurality of message regions (i.e., regions wheresent or received messages are respectively displayed) included in amessage display region 2010, respectively.

In addition, as illustrated in FIG. 19B, the first wirelesscommunication device 100 may display a message sent time and a messagereceived time based on the time zone information of the first wirelesscommunication device 100 and a message sent time and a message receivedtime based on the time zone information of the second wirelesscommunication device 200 together. However, exemplary embodiments arenot limited thereto.

The first wireless communication device 100 may display a date divisionline between message regions on which sent or received messages aredisplayed. The date division line may be a line that is marked, when thedate changes during message exchange, to distinguish a message exchangedbefore the date is changed from a message exchanged after the date waschanged. However, exemplary embodiments are not limited thereto, and thedate division line may be any of various types of objects other than aline that are marked to distinguish a message exchanged before the dateis changed from a message exchanged after the date was changed.

For example, when a first message is exchanged on October 22 and asecond message is exchanged on October 23, the first wirelesscommunication device 100 may display a date division line 2040 between afirst message region 2020 on which the first message is displayed and asecond message region 2030 on which the second message is displayed.

In this case, the first wireless communication device 100 according toan exemplary embodiment may display at least one selected from a datedivision line based on the time zone information of the first wirelesscommunication device 100 and a date division line based on the time zoneinformation of the second wireless communication device 200.

For example, when the date on which the first message was sent isOctober 22 based on the time zone information of the first wirelesscommunication device 100 and is also October 22 based on the time zoneinformation of the second wireless communication device 20, the date onwhich the second message was received is October 22 based on the timezone information of the first wireless communication device 100 and isOctober 23 based on the time zone information of the second wirelesscommunication device 200, and the date on which a third message was sentis October 23 based on the time zone information of the first wirelesscommunication device 100 and is also October 23 based on the time zoneinformation of the second wireless communication device 20, the firstwireless communication device 100 may display the first date divisionline 2040 between the first message region 2020 and the second messageregion 2030 based on the time zone information of the second wirelesscommunication device 200. Alternatively, the first wirelesscommunication device 100 may display a second date division line 2060between the second message region 2030 and a third message region 2050.

The first wireless communication device 100 may display both the firstdate division line 2040 and the second date division line 2060, displayonly the first date division line 2040, or display only the second datedivision line 2060, according to user settings. When the first wirelesscommunication device 100 displays both the first date division line 2040and the second date division line 2060, it may display them so that theymay be distinguished from each other.

Accordingly, the first wireless communication device 100 may easilyrecognize a date change based on the time zone information of the firstwireless communication device 100 and a date change based on the timezone information of the second wireless communication device 200.

FIG. 21 illustrates a message screen displayed on the first wirelesscommunication device 100 during message exchange between the first andsecond wireless communication devices 100 and 200, according to anexemplary embodiment.

As illustrated in FIG. 21, the user of the second wireless communicationdevice 200 may write a text mentioning the time based on the time zoneinformation of the second wireless communication device 200 and may sendthe text to the first user. For example, the second user may send thefirst user a message including a text of ‘10 am tomorrow’.

In this case, when the time zone information of the first wirelesscommunication device 100 is different from the time zone information ofthe second wireless communication device 200, the first user mayunderstand the text ‘10 am tomorrow’ received from the second user,based on the time zone information of the first wireless communicationdevice 100. Thus, smooth communication between the first user and thesecond user may not occur.

When a message received from the second wireless communication device200 includes a text indicating time, the first wireless communicationdevice 100 according to an exemplary embodiment may change the timeindicated by the text to the time calculated based on the time zoneinformation of the first wireless communication device 100 and displaythe calculated time.

For example, as illustrated in FIG. 21, when a message 2110 receivedfrom the second wireless communication device 200 includes a text of ‘10am tomorrow’, the first wireless communication device 100 may receivethe time zone information of the second wireless communication device200 and thus may determine whether the time zone information of thesecond wireless communication device 200 is different from the time zoneinformation of the first wireless communication device 100.

When the time zone information of the second wireless communicationdevice 200 is different from the time zone information of the firstwireless communication device 100, the first wireless communicationdevice 100 may change the text ‘10 am tomorrow’ based on the time zoneinformation of the second wireless communication device to a text ‘13:20tomorrow (October 23)’ based on the time zone information of the firstwireless communication device 100 and may display a changed text 2120corresponding to the text ‘13:20 tommorrow (October 23)’ on the messagescreen. The wireless communication device may also display the timezone, in addition to the time, to avoid further confusion.

Accordingly, the first user may recognize what month, what day, and whattime the time received from the second user is based on the time zoneinformation of the first wireless communication device 100, and thus mayperform smooth communication with the second user.

FIG. 22 is a flowchart of a method of making a reservation for messagetransmission from the first wireless communication device 100 to thesecond wireless communication device 200, according to an exemplaryembodiment.

Referring to FIG. 22, the first wireless communication device 100 mayreceive a reserved sending time for sending a message to the secondwireless communication device 200, based on the time zone information ofthe second wireless communication device 200, in operation S2210. Forexample, when second time zone information of the second wirelesscommunication device 200 is different from first time zone informationof the first wireless communication device 100, the first user of thefirst wireless communication device 100 may input the reserved sendingtime based on the time of the second wireless communication device 200.In this regard, the wireless communication device 100 may store andqueue messages to be transmitted, once a time for each message isreached. The time for sending each message may be associated withavailability of a user of the destination wireless communication device200, which may be based on the time zone information, as describedbelow.

In operation S2220, when the time of the second wireless communicationdevice 200 reaches the reserved sending time, the first wirelesscommunication device 100 may transmit a reserved message to the secondwireless communication device 200, based on the time zone information ofthe second wireless communication device 200.

In operation S2230, the first wireless communication device 100 mayoutput a notification message indicating that message transmission tothe second wireless communication device 200 has been completed. Forexample, the first wireless communication device 100 may display thenotification message on a status indication window of the first wirelesscommunication device 100 or a notification panel. The notificationmessage may include a text indicating completion of messagetransmission, a message transmission completed time, and the like. Thefirst wireless communication device 100 may output the notificationmessage indicating that message transmission to the second wirelesscommunication device 200 has been completed, as an audio signal or avibration signal.

This will now be described in greater detail with reference to FIGS. 23Aand 23B.

FIGS. 23A and 23B illustrate a message transmission reservation settingscreen according to an exemplary embodiment.

The first wireless communication device 100 according to an exemplaryembodiment may display a screen for setting a message transmissionreservation time. For example, as illustrated in FIG. 23A, the firstuser (i.e., the user of the first wireless communication device 100) mayset the time at which the first user wants to send a message to thesecond user (i.e., the user of the second wireless communication device200), by using the first wireless communication device 100.

The first wireless communication device 100 may receive the time zoneinformation of the second wireless communication device 200. When thereceived time zone information of the second wireless communicationdevice 200 is different from the time zone information of the firstwireless communication device 100, the first wireless communicationdevice 100 may display the time zone information of the second wirelesscommunication device 200 on a message transmission reservation settingwindow 2310. The time zone information of the second wirelesscommunication device 200 may include standard time zone information,current time information, location information, and the like thereof.FIG. 23A illustrates a case where the received time zone information ofthe second wireless communication device 200 is location information‘New York’.

The first user may set a message transmission reservation time based onthe time zone information of the second wireless communication device200. For example, as illustrated in FIG. 23A, the first user may set themessage transmission reservation time so that a message may betransmitted at 8 am based on the time of New York where the secondwireless communication device 200 is located.

The first wireless communication device 100 may also display what timethe message transmission reservation time set based on the time zoneinformation of the second wireless communication device 200 is based onthe time zone information of the first wireless communication device100.

For example, as illustrated in FIG. 23A, when the message transmissionreservation time is set to 8 am based on New York time, a reservationsetting time 2320 (for example, User time is 17:00) based on the timezone information of the first wireless communication device 100 may alsobe displayed. Accordingly, the first user may set the messagetransmission reservation time based on the time zone information of theuser of the second wireless communication device 200.

As such, when the first wireless communication device 100 sets a messagetransmission reservation based on the time zone information of thesecond wireless communication device 200 and the time of the secondwireless communication device 200 reaches the message transmissionreservation time, the first wireless communication device 100 maytransmit a reserved message to the second wireless communication device200.

As illustrated in FIG. 23B, when transmission of the reserved message iscompleted, the first wireless communication device 100 may output anotification message indicating that transmission of the reservedmessage to the second wireless communication device 200 has beencompleted. For example, the first wireless communication device 100 maydisplay a notification message 2330 saying ‘Message is sent to Claire inNew York, Claire's time is AM 8:00 23 October’ on a status indicationwindow.

FIG. 24 is a flowchart of a method of displaying the time zoneinformation of the second wireless communication device 200 when a callapplication in the first wireless communication device 100 is executed,according to an exemplary embodiment.

Referring to FIG. 24, the first wireless communication device 100 mayexecute a call application, in operation S2410. When the callapplication is executed, the first wireless communication device 100 mayreceive the identification information of the second wirelesscommunication device 200 to which a call connection is to be requested,in operation S2420.

For example, when the user of the first wireless communication device100 (i.e., the first user) requests a call connection to the user of thesecond wireless communication device 200 (i.e., the second user), thefirst user may directly input identification information of the secondwireless communication device 200 (for example, the name, nick name,telephone number, e-mail address, photograph, or shortcut number of thesecond user) or may select identification information from a list (forexample, contact information in the first wireless communication device100) including pieces of identification information of the secondwireless communication device 200.

In operation S2430, the first wireless communication device 100 mayreceive the time zone information of the first wireless communicationdevice 100 based on the identification information of the secondwireless communication device 200.

For example, the first wireless communication device 100 may extract thetime zone information of the second wireless communication device 200included in the contact information in the first wireless communicationdevice 100, by using the identification information of the secondwireless communication device 200. Alternatively, the first wirelesscommunication device 100 may transmit the identification information ofthe second wireless communication device 200 to the server 300, requestthe server 300 for the time zone information of the second wirelesscommunication device 200, and receive the time zone information of thesecond wireless communication device 200 from the server 300.

In operation S2440, the first wireless communication device 100 maydetermine whether the received time zone information of the secondwireless communication device 200 is different from the time zoneinformation of the first wireless communication device 100.

For example, the first wireless communication device 100 may compare thestandard time zone information, the current time information, thelocation information, or the like of the first wireless communicationdevice 100 with the standard time zone information, the current timeinformation, the location information, or the like of the secondwireless communication device 200 to determine whether the time zoneinformation of the second wireless communication device 200 is differentfrom the time zone information of the first wireless communicationdevice 100.

When it is determined that the received time zone information of thesecond wireless communication device 200 is different from the time zoneinformation of the first wireless communication device 100, the firstwireless communication device 100 may display the time zone informationof the second wireless communication device 200 in a call window of thefirst wireless communication device 100, in operation S2450.

For example, the first wireless communication device 100 may display thestandard time zone information, the current time information, thelocation information, brief information, and the like of the secondwireless communication device 200. This will be described in greaterdetail below with reference to FIGS. 25A-25D.

The first wireless communication device 100 according to an exemplaryembodiment displays the time zone information of the second wirelesscommunication device 200 before the user of the first wirelesscommunication device 100 requests a call connection to the user of thesecond wireless communication device 200, whereby the first user mayascertain in advance whether the second user is available for a call.

FIGS. 25A-25D illustrate an example in which the first wirelesscommunication device 100 displays the time zone information of thesecond wireless communication device 200 before a call is connected tothe second wireless communication device 200, according to an exemplaryembodiment.

As illustrated in FIG. 25A, the user of the first wireless communicationdevice 100 may directly input identification information of the secondwireless communication device 200 to which a call connection is to berequested, or select the name of the user of the second wirelesscommunication device 200 (for example, Claire) from a contactinformation list stored in the first wireless communication device 100.

When the name of the user of the second wireless communication device200 is selected, the first wireless communication device 100 may requestthe server 300 for the time zone information of the second wirelesscommunication device 200 and receive the time zone information of thesecond wireless communication device 200 from the server 300, based onthe selected name of the user of the second wireless communicationdevice 200. Alternatively, the first wireless communication device 100may extract the time zone information of the second wirelesscommunication device 200 stored in the contact information in the firstwireless communication device 100.

When the time zone information of the second wireless communicationdevice 200 is different from the time zone information of the firstwireless communication device 100, as illustrated in FIG. 25B, the firstwireless communication device 100 may display time zone information 2510of the second wireless communication device 200 around an area on whichthe identification information of the second wireless communicationdevice 200 (for example, the name of the second user) is displayed. Thetime zone information of the second wireless communication device 200may be the standard time zone information, the current time information,the location information, or the like of the second wirelesscommunication device 200, but is not limited thereto.

Alternatively, as illustrated in FIG. 25C, the first wirelesscommunication device 100 may display a brief information icon 2520briefly indicating the time zone information of the second wirelesscommunication device 200. For example, when the second wirelesscommunication device 200 is located in a region where it is nighttime,the brief information icon 2520 displays a moon to indicate that thesecond wireless communication device 200 is located in a region where itis nighttime. On the other hand, when the second wireless communicationdevice 200 is located in a region where it is daytime, the briefinformation icon 2520 displays a sun to indicate that the secondwireless communication device 200 is located in a region where it isdaytime.

Accordingly, when the time zone information of the second wirelesscommunication device is expressed as an icon on which a moon isdisplayed, the first user may determine that the user of the secondwireless communication device is at a time zone when it is impossible toreceive a call.

Alternatively, as illustrated in FIG. 25D, the first wirelesscommunication device 100 may display a brief information icon 2530indicating whether the user of the second wireless communication device200 is available for a call. For example, when the user of the secondwireless communication device 200 is not available for a call, the briefinformation icon 2520 displays an image of ‘No call’ to indicate thatthe user of the second wireless communication device 200 is notavailable for a call.

As described above, the first wireless communication device 100according to an exemplary embodiment displays the time zone informationof the second wireless communication device 200 before the user of thefirst wireless communication device 100 requests a call connection tothe user of the second wireless communication device 200, whereby thefirst user may ascertain in advance whether the second user is availablefor a call.

FIG. 26 is a flowchart of a method of displaying the time zoneinformation of the second wireless communication device 200 when thefirst wireless communication device 100 selects a ‘call’ key, accordingto an exemplary embodiment.

Referring to FIG. 26, the first wireless communication device 100 mayexecute a call application (i.e., an application to execution thefunction of making a telephone call), in operation S2610.

When the call application is executed, the first wireless communicationdevice 100 may receive the identification information of the secondwireless communication device 200 to which a call connection is to berequested, in operation S2620.

Because operations S2610 and S2620 of FIG. 26 correspond to operationsS2410 and S2420 of FIG. 24, a repeated description thereof will beomitted.

In operation S2630, the first wireless communication device 100 mayreceive an input of selecting a ‘call’ key.

When the first wireless communication device 100 receives the input ofselecting the ‘call’ key, the first wireless communication device 100may receive the time zone information of the second wirelesscommunication device 200 based on the identification information of thesecond wireless communication device 200, in operation S2640. Inoperation S2650, the first wireless communication device 100 maydetermine whether the received time zone information of the secondwireless communication device 200 is different from the time zoneinformation of the first wireless communication device 100.

Because operations S2640 and S2650 of FIG. 26 correspond to operationsS2430 and S2440 of FIG. 24, a repeated description thereof will beomitted.

When it is determined that the received time zone information of thesecond wireless communication device 200 is different from the time zoneinformation of the first wireless communication device 100, the firstwireless communication device 100 may display the time zone informationof the second wireless communication device 200 in a call window of thefirst wireless communication device 100, in operation S2660.

For example, the first wireless communication device 100 may request acall connection to the second wireless communication device 200 and atthe same time may display the time zone information of the secondwireless communication device 200 on a call connection request screen.Alternatively, the first wireless communication device 100 may display amessage window indicating the time zone information of the secondwireless communication device 200. This will now be described in greaterdetail with reference to FIGS. 27A-30B.

FIGS. 27A and 27B illustrate an example in which the first wirelesscommunication device 100 displays the time zone information of thesecond wireless communication device 200 when requesting a callconnection to the second wireless communication device 200, according toan exemplary embodiment.

As illustrated in FIG. 27A, the user of the first wireless communicationdevice 100 may directly input identification information of the secondwireless communication device 200 to which a call connection is to berequested, or select the name of the user of the second wirelesscommunication device 200 (for example, Claire) from a contactinformation list stored in the first wireless communication device 100.

When the identification information of the second wireless communicationdevice 200 is input, the user of the first wireless communication device100 may select a ‘call’ key 2720. In response to the ‘call’ keyselection, the first wireless communication device 100 may request theserver 300 for the time zone information of the second wirelesscommunication device 200 and receive the time zone information of thesecond wireless communication device 200 from the server 300, based onthe input identification information of the second wirelesscommunication device 200. Alternatively, the first wirelesscommunication device 100 may extract the time zone information of thesecond wireless communication device 200 stored in the contactinformation in the first wireless communication device 100.

When it is determined that the received time zone information of thesecond wireless communication device 200 is different from the time zoneinformation of the first wireless communication device 100, asillustrated in FIG. 27B, the first wireless communication device 100 maydisplay the time zone information of the second wireless communicationdevice 200 on a call connection screen while requesting a callconnection to the second wireless communication device 200.

For example, the first wireless communication device 100 may display thestandard time zone information, the current time information, thelocation information, and the like of the second wireless communicationdevice 200, and the time zone information of the second wirelesscommunication device 200 may be displayed as a brief information icon.In the case of FIG. 27B, time zone information 2730 of the secondwireless communication device 200 may be expressed as current timeinformation (i.e., 16:01) and location information (i.e., New York) ofthe second wireless communication device 200.

Even when calling of the first wireless communication device 100 isconnected to the second wireless communication device 200 and the firstwireless communication device 100 and the second wireless communicationdevice 20 are in the middle of conversion, the first wirelesscommunication device 100 may display the time zone information of thesecond wireless communication device on a mid-call screen. Accordingly,the first user may ascertain the time zone information of the seconduser as a counterpart call participant even when requesting a callconnection to the second user or in the middle of conversion with thesecond user.

FIGS. 28A and 28B illustrate an example in which the first wirelesscommunication device 100 displays the time zone information of thesecond wireless communication device 200 when requesting a callconnection to the second wireless communication device 200, according toan exemplary embodiment.

As illustrated in FIG. 28A, the user of the first wireless communicationdevice 100 may directly input identification information of the secondwireless communication device 200 to which a call connection is to berequested, or select the name of the user of the second wirelesscommunication device 200 (for example, Claire) from a contactinformation list stored in the first wireless communication device 100.

When the identification information of the second wireless communicationdevice 200 is input, the user of the first wireless communication device100 may select a ‘call’ key 2820. In response to the ‘call’ keyselection, the first wireless communication device 100 may request theserver 300 for the time zone information of the second wirelesscommunication device 200 and receive the time zone information of thesecond wireless communication device 200 from the server 300, based onthe input identification information of the second wirelesscommunication device 200. Alternatively, the first wirelesscommunication device 100 may extract the time zone information of thesecond wireless communication device 200 stored in the contactinformation in the first wireless communication device 100.

When the time zone information of the second wireless communicationdevice 200 is different from the time zone information of the firstwireless communication device 100, the first wireless communicationdevice 100 may display a message window indicating the time zoneinformation of the second wireless communication device 200.

For example, referring to FIG. 28B, the first wireless communicationdevice 100 may display a message 2830 that indicates current timeinformation (e.g., 22:53) of the second wireless communication device200 and that asks if a call connection is to proceed. Although thedisplayed time zone information of the second wireless communicationdevice 200 is the current time information thereof in FIG. 28B,exemplary embodiments are not limited thereto. The displayed time zoneinformation of the second wireless communication device 200 may be thestandard time zone information, the location information, the briefinformation icon, or the like of the second wireless communicationdevice 200.

Accordingly, the first user may check the time zone information of thesecond wireless communication device 200 displayed on a message windowand then may determine whether to request a call connection to thesecond wireless communication device 200. For example, when the firstuser selects a ‘yes’ key, the first wireless communication device 100may requests a call connection to the second wireless communicationdevice 200. On the other hand, when the first user selects a ‘no’ key,the first wireless communication device 100 may conclude the callapplication without requesting a call connection to the second wirelesscommunication device 200.

FIGS. 29A and 29B illustrate an example in which the first wirelesscommunication device 100 displays the time zone information of thesecond wireless communication device 200 when requesting a callconnection to the second wireless communication device 200, according toan exemplary embodiment.

As illustrated in FIG. 29A, the user of the first wireless communicationdevice 100 may directly input identification information of the secondwireless communication device 200 to which a call connection is to berequested, or select the name of the user of the second wirelesscommunication device 200 (for example, Claire) from a contactinformation list stored in the first wireless communication device 100.

When the identification information of the second wireless communicationdevice 200 is input, the user of the first wireless communication device100 may select a ‘call’ key 2920. In response to the ‘call’ keyselection, the first wireless communication device 100 may request theserver 300 for the time zone information of the second wirelesscommunication device 200 and receive the time zone information of thesecond wireless communication device 200 from the server 300, based onthe input identification information of the second wirelesscommunication device 200. Alternatively, the first wirelesscommunication device 100 may extract the time zone information of thesecond wireless communication device 200 stored in the contactinformation in the first wireless communication device 100.

When the time zone information of the second wireless communicationdevice 200 is different from the time zone information of the firstwireless communication device 100, the first wireless communicationdevice 100 may display a message that indicates the time zoneinformation of the second wireless communication device 200 andalternative communication options instead of call.

For example, referring to FIG. 29B, the first wireless communicationdevice 100 may display a message 2930 that indicates current timeinformation (for example, 22:53) of the second wireless communicationdevice 200 and shows a call connection option and alternativecommunication options (for example, text message and e-mail).

In this case, the first wireless communication device 100 may determinewhether the time zone information of the second wireless communicationdevice 200 is daytime or nighttime, whether the time zone information ofthe second wireless communication device 200 is later than a presettime, or whether the time zone information of the second wirelesscommunication device 200 is earlier than another preset time, to therebydetermine whether to provide an alternative communication option to thefirst user.

For example, when it is determined that the time zone information of thesecond wireless communication device 200 received by the first wirelesscommunication device 100 is nighttime or a daybreak time zone, the firstwireless communication device 100 may display the message 2930indicating alternative communication options instead of communication bytelephone call.

Alternatively, when it is determined that the time zone information ofthe second wireless communication device 200 received by the firstwireless communication device 100 is after a first time (for example,12:00 midnight) set by the second wireless communication device 200 orthat the time zone information of the second wireless communicationdevice 200 received by the first wireless communication device 100 isbefore a second time (for example, 6:00 am) set by the second wirelesscommunication device 200, the first wireless communication device 100may display the message 2930 indicating alternative communicationoptions instead of communication by telephone call.

Accordingly, the first user may check the time zone information of thesecond wireless communication device 200 displayed on a message windowand then may determine whether to request a call connection to thesecond wireless communication device 200. For example, when the firstuser selects a call connection option, the first wireless communicationdevice 100 may request a call connection to the second wirelesscommunication device 200.

When the first user selects a message transmission option, the callapplication may be concluded, a message application may be executed, anda message window for transmitting a message to the second wirelesscommunication device 200 may be displayed based on the identificationinformation of the second wireless communication device 200.

When the first user selects an e-mail transmission option, the callapplication may be concluded, an e-mail application may be executed, anda message window for transmitting a message to the second wirelesscommunication device 200 may be displayed based on the identificationinformation of the second wireless communication device 200.

When the first user selects a cancel option, the first wirelesscommunication device 100 may conclude the call application withoutrequesting a call connection to the second wireless communication device200.

FIGS. 30A and 30B illustrate an example in which the first wirelesscommunication device 100 displays the time zone information of thesecond wireless communication device 200 when requesting a callconnection to the second wireless communication device 200, according toan exemplary embodiment.

As illustrated in FIG. 30A, the user of the first wireless communicationdevice 100 may directly input identification information of the secondwireless communication device 200 to which a call connection is to berequested, or select the name of the user of the second wirelesscommunication device 200 (for example, Claire) from a contactinformation list stored in the first wireless communication device 100.

When the identification information of the second wireless communicationdevice 200 is input, the user of the first wireless communication device100 may select a ‘call’ key 3020. In response to the ‘call’ keyselection, the first wireless communication device 100 may request theserver 300 for the time zone information of the second wirelesscommunication device 200 and receive the time zone information of thesecond wireless communication device 200 from the server 300, based onthe input identification information of the second wirelesscommunication device 200. Alternatively, the first wirelesscommunication device 100 may extract the time zone information of thesecond wireless communication device 200 stored in the contactinformation in the first wireless communication device 100.

When the time zone information of the second wireless communicationdevice 200 is different from the time zone information of the firstwireless communication device 100, the first wireless communicationdevice 100 may display a message that indicates the time zoneinformation of the second wireless communication device 200 and the askswhether to set a call reservation.

For example, referring to FIG. 30B, the first wireless communicationdevice 100 may display a message 3030 that indicates current timeinformation (e.g., 22:53) of the second wireless communication device200 and that asks whether to set a call reservation.

In this case, the first wireless communication device 100 may determinewhether the time zone information of the second wireless communicationdevice 200 is daytime or nighttime, whether the time zone information ofthe second wireless communication device 200 is later than a presettime, or whether the time zone information of the second wirelesscommunication device 200 is earlier than another preset time.

For example, when it is determined that the time zone information of thesecond wireless communication device 200 received by the first wirelesscommunication device 100 is nighttime or a daybreak time zone, the timezone information of the second wireless communication device 200received by the first wireless communication device 100 is after a firsttime (for example, 12 midnight) set by the second wireless communicationdevice 200 or that the time zone information of the second wirelesscommunication device 200 received by the first wireless communicationdevice 100 is before a second time (for example, 6 am) set by the secondwireless communication device 200, the first wireless communicationdevice 100 may display the message 3020 asking whether to set a callreservation.

When the first user selects a ‘yes’ key, a call reservation settingscreen may be displayed, which will now be described in detail withreference to FIGS. 31A and 31B.

FIGS. 31A and 31B illustrate a call reservation setting screen accordingto an exemplary embodiment.

The first wireless communication device 100 according to an exemplaryembodiment may display a screen for setting a call reservation time.Referring to FIGS. 31A and 31B, the first wireless communication device100 may directly input identification information of the second wirelesscommunication device 200 to which a call connection is to be reserved orselect the second wireless communication device 200 from a contactinformation list stored in the first wireless communication device 100,and may select a call reservation setting menu.

The first wireless communication device 100 may receive the time zoneinformation of the second wireless communication device 200. When thereceived time zone information of the second wireless communicationdevice 200 is different from the time zone information of the firstwireless communication device 100, the first wireless communicationdevice 100 may display the time zone information of the second wirelesscommunication device 200 on a call reservation setting window 3110. Thetime zone information of the second wireless communication device 200may include standard time zone information, current time information,location information, and the like thereof. FIG. 31A illustrates a casewhere the received time zone information of the second wirelesscommunication device 200 is location information ‘New York’.

Alternatively, as described above in FIG. 30B, when a ‘yes’ key isselected on a message asking whether to set a call reservation, the callreservation setting window 3110, via which a call reservation for a callto the second wireless communication device 200 may be set, may bedisplayed.

When the call reservation setting window 3110 is displayed, the firstuser may set a call reservation time based on the time zone informationof the second wireless communication device 200. For example, asillustrated in FIG. 31A, the first user may set the call reservationtime so that a call reservation notification message may be output at8:00 am based on the time of New York where the second wirelesscommunication device 200 is located.

The first wireless communication device 100 may also display what timethe call reservation time set based on the time zone information of thesecond wireless communication device 200 is based on the time zoneinformation of the first wireless communication device 100. For example,as illustrated in FIG. 31A, when the call reservation time is set to8:00 am based on New York time, a reservation setting time 3120 (forexample, User time is 17:00) based on the time zone information of thefirst wireless communication device 100 may also be displayed.

Accordingly, the first user may set the call reservation time based onthe time zone information of the user of the second wirelesscommunication device 200, and may also display the time zone informationof the first wireless communication device 100, whereby the callreservation time may be set to be the time when the first user and thesecond user are both available for a call.

As such, when the first wireless communication device 100 sets a callreservation based on the time zone information of the second wirelesscommunication device 200 and the time of the second wirelesscommunication device 200 reaches the call reservation time, the firstwireless communication device 100 may output a call reservationnotification message.

Referring to FIG. 31B, when the time of a region where the secondwireless communication device 200 is located reaches the set callreservation time, the first wireless communication device 100 maydisplay a message 3130 that indicates the call reservation time (i.e.,8:00 am) and that asks whether to connect a call.

In this case, when the first user selects a ‘yes’ key, the firstwireless communication device 100 may request a call connection to thesecond wireless communication device 200.

FIGS. 32A and 32B illustrate an example in which the first wirelesscommunication device 100 displays the time zone information of thesecond wireless communication device 200 when requesting a callconnection to the second wireless communication device 200, according toan exemplary embodiment.

As illustrated in FIG. 32A, the user of the first wireless communicationdevice 100 may directly input identification information of the secondwireless communication device 200 to which a call connection is to berequested, or select the name of the user of the second wirelesscommunication device 200 (for example, Claire) from a contactinformation list stored in the first wireless communication device 100.

When the identification information of the second wireless communicationdevice 200 is input, the user of the first wireless communication device100 may select a ‘call’ key 3220. In response to the ‘call’ keyselection, the first wireless communication device 100 may request theserver 300 for the time zone information of the second wirelesscommunication device 200 and receive the time zone information of thesecond wireless communication device 200 from the server 300, based onthe input identification information of the second wirelesscommunication device 200. Alternatively, the first wirelesscommunication device 100 may extract the time zone information of thesecond wireless communication device 200 stored in the contactinformation in the first wireless communication device 100.

When the time zone information of the second wireless communicationdevice 200 is different from the time zone information of the firstwireless communication device 100, the first wireless communicationdevice 100 may display a message that indicates the time zoneinformation of the second wireless communication device 200 and the askswhether to set a call reservation.

For example, referring to FIG. 32B, the first wireless communicationdevice 100 may display a message 3230 that indicates current timeinformation (e.g., 22:53) of the second wireless communication device200 and also asks whether to send a call request message. The callrequest message is a message that requests the second wirelesscommunication device 200 to call the first wireless communication device100.

In this case, the first wireless communication device 100 may determinewhether the time zone information of the second wireless communicationdevice 200 is daytime or nighttime, whether the time zone information ofthe second wireless communication device 200 is later than a presettime, or whether the time zone information of the second wirelesscommunication device 200 is earlier than another preset time.

For example, when it is determined that the time zone information of thesecond wireless communication device 200 received by the first wirelesscommunication device 100 is nighttime or a daybreak time zone, the timezone information of the second wireless communication device 200received by the first wireless communication device 100 is after a firsttime (for example, 12:00 midnight) set by the second wirelesscommunication device 200 or that the time zone information of the secondwireless communication device 200 received by the first wirelesscommunication device 100 is before a second time (for example, 6:00 am)set by the second wireless communication device 200, the first wirelesscommunication device 100 may display the message 3230 asking whether tosend a call request message.

When the first user selects a ‘yes’ key, a call request message settingscreen may be displayed, which will now be described in detail withreference to FIGS. 33A and 33B.

FIGS. 33A and 33B illustrate a call request message setting screenaccording to an exemplary embodiment.

The first wireless communication device 100 may directly inputidentification information of the second wireless communication device200 to which a call request message is to be sent or may select thesecond wireless communication device 200 from a contact information liststored in the first wireless communication device 100, and may select acall request message sending menu.

The first wireless communication device 100 may receive the time zoneinformation of the second wireless communication device 200. When thereceived time zone information of the second wireless communicationdevice 200 is different from the time zone information of the firstwireless communication device 100, as illustrated in FIG. 33A, the firstwireless communication device 100 may display the time zone informationof the second wireless communication device 200 on a call requestmessage setting window 3310. The time zone information of the secondwireless communication device 200 may include standard time zoneinformation, current time information, location information, and thelike thereof. FIG. 33A illustrates a case where the received time zoneinformation of the second wireless communication device 200 is locationinformation ‘New York’.

Alternatively, as described above in FIG. 32B, when a ‘yes’ key isselected on a message asking whether to send a call request message, thecall request message setting window 3310, via which a call requestmessage may be set to be transmitted to the second wirelesscommunication device 200, may be displayed.

When the call request message setting window 3310 is displayed, thefirst user may set a call request message based on the time zoneinformation of the second wireless communication device 200. Forexample, as illustrated in FIG. 33A, the first user may set a callrequest message transmission time so that a call request message may beoutput to the second wireless communication device 200 at 8:00 am basedon the time of New York where the second wireless communication device200 is located.

The first wireless communication device 100 may also display what timethe call request message transmission time set based on the time zoneinformation of the second wireless communication device 200 is based onthe time zone information of the first wireless communication device100. For example, as illustrated in FIG. 33A, when the call requestmessage transmission time is set to 8:00 am based on New York time, areservation setting time 3320 (for example, User time is 17:00) based onthe time zone information of the first wireless communication device 100may also be displayed.

Accordingly, the first user may set the call request messagetransmission time based on the time zone information of the user of thesecond wireless communication device 200 and may also display the timezone information of the first wireless communication device 100, wherebythe call request message transmission time may be set to be the timewhen the first user and the second user are both available for a call.

As such, when the first wireless communication device 100 sets a callrequest message transmission time based on the time zone information ofthe second wireless communication device 200 and the time of the secondwireless communication device 200 reaches the set call request messagetransmission time, the second wireless communication device 200 mayoutput a call request message.

Referring to FIG. 33B, when the time of a region where the secondwireless communication device 200 is located reaches the set callrequest message transmission time, the first wireless communicationdevice 100 may transmit a call request message 3330 to the secondwireless communication device 200, and the second wireless communicationdevice 200 may display a call request message 3330. In this case, thesecond user may request a call connection to the first user.

FIG. 34 illustrates an example in which the first wireless communicationdevice 100 displays the time zone information of the second wirelesscommunication device 200 when receiving a call connection request fromthe second wireless communication device 200, according to an exemplaryembodiment.

Referring to FIG. 34, the first wireless communication device 100 mayreceive the call connection request from the second wirelesscommunication device 200. In this case, the first wireless communicationdevice 100 may extract the time zone information of the second wirelesscommunication device 200 stored in the contact information in the firstwireless communication device 100. Alternatively, the server 300 mayreceive the time zone information of the second wireless communicationdevice 200 from the server 300. Alternatively, when the first wirelesscommunication device 100 receives a call connection request from thesecond wireless communication device 200, the first wirelesscommunication device 100 may also receive the time zone information ofthe second wireless communication device 200.

The first wireless communication device 100 may compare the time zoneinformation of the second wireless communication device 200 with thetime zone information of the first wireless communication device 100.When the time zone information of the second wireless communicationdevice 200 is different from the time zone information of the firstwireless communication device 100, the first wireless communicationdevice 100 may display time zone information 3420 of the second wirelesscommunication device 200 on a call connection request receiving screen.

In this case, the first wireless communication device 100 may displaythe standard time zone information, the current time information, thelocation information, and the like of the second wireless communicationdevice 200, as the time zone information 3420 of the second wirelesscommunication device 200. For example, as illustrated in FIG. 34, ‘23:01October in New York’ may be displayed as the time zone information 3420of the second wireless communication device 200.

Accordingly, the first user may ascertain the time zone information ofthe second user, before selecting a call connection button.

FIG. 35 illustrates an example in which the first wireless communicationdevice 100 displays the time zone information of the second wirelesscommunication device 200 when an SNS application is executed, accordingto an exemplary embodiment.

The SNS application is an application that provides social networkingservices (SNSs), which are online services that establish a networkbetween people who share a particular interest or activity. Subscribersto SNSs, such as, Twitter™ and Facebook™, may share information andopinions with one another and expand interpersonal relations.

Referring to FIG. 35, when the user of the first wireless communicationdevice 100 (i.e., the first user) executes an SNS application, the firstwireless communication device 100 may display content (for example,text, audio files, images, and moving pictures) that the first user orsecond users connected to the first user via an SNS has registered orshared with each other.

The first wireless communication device 100 may also display the timewhen the first user or the second users has registered or shared thecontent with each other.

In this case, the first wireless communication device 100 may receivetime zone information of a region where the wireless communicationdevice of the second user (i.e., the second wireless communicationdevice 200) is located. When the received time zone information of thesecond wireless communication device 200 is different from the time zoneinformation of the first wireless communication device 100, the firstwireless communication device 100 may display the time zone informationof the second wireless communication device 200.

Alternatively, the server 300 (for example, an SNS server) may receivethe time zone information of the first wireless communication device 100and the time zone information of the second wireless communicationdevice 200 and compare them with each other. When the time zoneinformation of the first wireless communication device 100 and the timezone information of the second wireless communication device 200 aredifferent from each other, the server 300 may transmit the time zoneinformation of the second wireless communication device 200 to the firstwireless communication device 100. Accordingly, the first wirelesscommunication device 100 may display the time zone information of thesecond wireless communication device 200.

The time zone information of the second wireless communication device200 may be the standard time zone information, the current timeinformation, the location information, and the like thereof.

For example, as illustrated in FIG. 35, when the first wirelesscommunication device 100 of the first user (for example, Kate) islocated in Seoul and the second wireless communication device 200 of thesecond user (for example, Claire) is located in New York, the firstwireless communication device 100 may display a time 3510 (i.e., a firsttime) based on the time zone information of the first wirelesscommunication device 100 and a time 3520 (i.e., a second time) based onthe time zone information of the second wireless communication device200, as the time when the first user or the second user has registeredor shared the content with each other.

For example, the first time 3510 may be displayed in brackets, and thesecond time 3520 may be displayed without brackets. Alternatively, thefirst time 3510 and the second time 3520 may be displayed in differentcolors. Alternatively, the first time 3510 may be first displayed, and,when the first user selects (for example, touches) the first time 3510,the second time 3520 may be displayed.

Accordingly, the first user may easily ascertain when registered orshared content is registered or shared based on the time zoneinformation of the second user.

FIG. 36 illustrates an example in which the first wireless communicationdevice 100 displays the time zone information of the second wirelesscommunication device 200 when an e-mail application is executed,according to an exemplary embodiment.

When the user of the first wireless communication device 100 (i.e., thefirst user) wants to transmit an e-mail to the user of the secondwireless communication device 200 (i.e., the second user), the user ofthe first wireless communication device 100 may input the identificationinformation of the second wireless communication device 200. Forexample, the first user may directly input identification information ofthe second wireless communication device 200 (for example, the name,nickname, telephone number, e-mail address, photograph, shortcut number,or the like of the second user) or select identification information ofthe second wireless communication device 200 from a contact informationlist stored in the first wireless communication device 100.

When the identification information of the second wireless communicationdevice 200 is input, the first wireless communication device 100 mayreceive the time zone information of the second wireless communicationdevice 200 based on the identification information of the secondwireless communication device 200. For example, the first wirelesscommunication device 100 may request the server 300 for the time zoneinformation of the second wireless communication device 200 and receivethe time zone information of the second wireless communication device200 from the server 300, based on the identification information of thesecond wireless communication device 200.

Alternatively, the first wireless communication device 100 may extractthe time zone information of the second wireless communication device200 stored in the contact information in the first wirelesscommunication device 100, based on the identification information of thesecond wireless communication device 200.

The first wireless communication device 100 may compare the time zoneinformation of the second wireless communication device 200 with thetime zone information of the first wireless communication device 100.When the time zone information of the second wireless communicationdevice 200 is different from the time zone information of the firstwireless communication device 100, the first wireless communicationdevice 100 may display the time zone information of the second wirelesscommunication device 200. The time zone information of the secondwireless communication device 200 may be displayed as the standard timezone information, the current time information, the locationinformation, and the like thereof.

For example, as illustrated in FIG. 36, the first wireless communicationdevice 100 may display time zone information 3620 of the second wirelesscommunication device 200 (for example, 16:01 October 22 in New York) ona part of an e-mail screen.

Accordingly, the first wireless communication device 100 according to anexemplary embodiment displays the time zone information of the secondwireless communication device 200 on an e-mail screen so that the firstuser may ascertain whether the second user is able to receive an e-mailbefore transmitting the e-mail.

FIG. 37 is a flowchart of a method in which the first wirelesscommunication device 100 receives the time zone information of thesecond wireless communication device 200 based on whether the time zoneinformation of the second wireless communication device 200 is madeaccessible, according to an exemplary embodiment.

Referring to FIG. 37, in operation S3710, the second wirelesscommunication device 200 may receive an input as to whether the timezone information of the second wireless communication device 200 is madeaccessible to wireless communication devices related to the secondwireless communication device 200. For example, the user of the secondwireless communication device 200 (i.e., the second user) may setwhether the time zone information of the second wireless communicationdevice 200 is made accessible to an external wireless communicationdevice corresponding to identification information stored in contactinformation in the second wireless communication device 200, an externalwireless communication device corresponding to identificationinformation remaining in a call record in the second wirelesscommunication device 200, and a wireless communication device of a userwho belongs to the same social group together with the second user viaan SNS.

In operation S3720, the second wireless communication device 200 maytransmit to the server 300 setting information indicating whether timezone information of the second wireless communication device 200 is madeaccessible. In operation S3730, the server 300 may store the receivedsetting information.

In operation S3740, the second wireless communication device 200 maytransmit the time zone information of the second wireless communicationdevice 200 to the server 300. In operation S3750, the server 300 maystore the received time zone information of the second wirelesscommunication device 200 and compare pre-stored time zone information ofthe second wireless communication device 200 with the received time zoneinformation of the second wireless communication device 200 to determinewhether the time zone information of the second wireless communicationdevice 200 has changed.

When the time zone information of the second wireless communicationdevice 200 has changed, the server 300 may update and store the timezone information of the second wireless communication device 200, andmay determine whether the time zone information of the second wirelesscommunication device 200 is allowed to be accessible, based on thereceived setting information indicating whether the time zoneinformation of the second wireless communication device 200 is madeaccessible, in operation S3760.

When the time zone information of the second wireless communicationdevice 200 is not allowed to be accessible, the server 300 may nottransmit the time zone information of the second wireless communicationdevice 200 to wireless communication devices other than the secondwireless communication device 200.

When the time zone information of the second wireless communicationdevice 200 is not allowed to be accessible, the server 300 may notreceive the time zone information of the second wireless communicationdevice 200. For example, when the time zone information of the secondwireless communication device 200 is not allowed to be accessible, theserver 300 may not receive the time zone information of the secondwireless communication device 200 until receiving setting informationindicating that the time zone information of the second wirelesscommunication device 200 is allowed to be accessible.

On the other hand, when the time zone information of the second wirelesscommunication device 200 is allowed to be accessible, the server 300 maysearch for the first wireless communication device 100 related with thesecond wireless communication device 200, in operation S3770.

Examples of the first wireless communication device 100 related with thesecond wireless communication device 200 may include an externalwireless communication device corresponding to identificationinformation stored in contact information in the second wirelesscommunication device 200, an external wireless communication devicecorresponding to identification information remaining in a call recordin the second wireless communication device 200, and a wirelesscommunication device of a user who belongs to the same social grouptogether with the second user (i.e., the user of the second wirelesscommunication device 200) via an SNS.

Accordingly, in operation S3780, the server 300 may transmit changedtime zone information of the second wireless communication device 200 tothe found first wireless communication device 100. For example, theserver 300 may transmit changed standard time zone information, changedcurrent time information, changed location information, and the like ofthe second wireless communication device 200 to the first wirelesscommunication device 100.

FIG. 38 is a flowchart of a method in which the first wirelesscommunication device 100 receives the time zone information of thesecond wireless communication device 200 based on the range in which thetime zone information of the second wireless communication device 200 ismade accessible, according to an exemplary embodiment.

Referring to FIG. 38, the second wireless communication device 200 mayreceive an input about the range in which the time zone informationthereof is made accessible. At this time, the user of the secondwireless communication device 200 (i.e., the second user) may set therange in which the time zone information of the second wirelesscommunication device 200 is made accessible, in operation S3810. Forexample, the second user may set some of the external wirelesscommunication devices related with the second wireless communicationdevice 200, as the wireless communication devices to which the time zoneinformation of the second wireless communication device 200 is to bemade accessible.

In operation S3820, the second wireless communication device 200 maytransmit to the server 300 setting information indicating the range inwhich the time zone information of the second wireless communicationdevice 200 is made accessible. In operation S3830, the server 300 maystore the received setting information.

In operation S3840, the second wireless communication device 200 maytransmit the time zone information of the second wireless communicationdevice 200 to the server 300. In operation S3850, the server 300 maystore the received time zone information of the second wirelesscommunication device 200 and compare pre-stored time zone information ofthe second wireless communication device 200 with the received time zoneinformation of the second wireless communication device 200 to determinewhether the time zone information of the second wireless communicationdevice 200 has changed.

When the time zone information of the second wireless communicationdevice 200 has changed, the server 300 may update and store the timezone information of the second wireless communication device 200, andmay search for the first wireless communication device 100 allowed toaccess the time zone information of the second wireless communicationdevice 200, based on the received setting information indicating therange in which the time zone information of the second wirelesscommunication device 200 is made accessible, in operation S3860.

Accordingly, in operation S3870, the server 300 may transmit changedtime zone information of the second wireless communication device 200 tothe found first wireless communication device 100. For example, theserver 300 may transmit changed standard time zone information, changedcurrent time information, changed location information, and the like ofthe second wireless communication device 200 to the first wirelesscommunication device 100.

FIG. 39 is a flowchart of a method in which the first wirelesscommunication device 100 receives the time zone information of thesecond wireless communication device 200 when the second wirelesscommunication device 200 sets the time zone information of the secondwireless communication device 200 to be made accessible as briefinformation, according to an exemplary embodiment.

Referring to FIG. 39, the second wireless communication device 200 mayset the time zone information of the second wireless communicationdevice 200 to be made accessible as brief information, in operationS3910. The brief information may be information briefly indicating thetime zone information of the second wireless communication device 200,and only whether the second wireless communication device 200 is locatedin a region where it is a.m. or p.m., or it is morning, afternoon, ornight may be ascertained from the brief information.

For example, the brief information may be displayed as a briefinformation icon. A brief information icon on which a sun is displayedmay indicate that the second wireless communication device 200 islocated in a region where it is daytime. A brief information icon onwhich a moon is displayed may indicate that the second wirelesscommunication device 200 is located in a region where it is nighttime.

In operation S3920, the second wireless communication device 200 maytransmit time zone information setting information to the server 300. Inoperation S3930, the server 300 may store the received time zoneinformation setting information.

In operation S3940, the second wireless communication device 200 maytransmit the time zone information of the second wireless communicationdevice 200 to the server 300. In operation S3950, the server 300 maychange the received time zone information of the second wirelesscommunication device 200 to brief information and store the briefinformation.

In operation S3960, the server 300 may compare brief informationcorresponding to pre-stored time zone information of the second wirelesscommunication device 200 with the brief information corresponding to thereceived time zone information of the second wireless communicationdevice 200 to determine whether the brief information of the secondwireless communication device 200 has changed.

If it is determined that the brief information of the second wirelesscommunication device 200 has changed, the server 300 may update andstore the brief information of the second wireless communication device200, and may search for the first wireless communication device 100related with the second wireless communication device 200, in operationS3970. Because operation S3970 of FIG. 39 corresponds to operation S3770of FIG. 37, a repeated description thereof will be omitted.

Accordingly, in operation S3980, the server 300 may transmit changedbrief information of the second wireless communication device 200 to thefound first wireless communication device 100.

Alternatively, the second wireless communication device 200 may changethe time zone information of the second wireless communication device200 to brief information and transmit the brief information instead ofthe time zone information of the second wireless communication device200 to the server 300, in operation S3940. In this case, not only thefirst wireless communication device 100 related with the second wirelesscommunication device 200 but also the server 300 may not ascertaindetailed time zone information of the second wireless communicationdevice 200. Accordingly, security may be strengthened in the personalinformation of the user of the second wireless communication device 200.

FIGS. 40, 41A, and 41B illustrate a screen for setting whether the timezone information of the second wireless communication device is madeaccessible.

As illustrated in FIG. 40, the second wireless communication device 200may provide a graphical user interface (GUI) 4110 for setting whetherthe time zone information of the second wireless communication device200 is made accessible. In this case, when the user of the secondwireless communication device 200 (i.e., the second user) does not wantto make the time zone information of the second wireless communicationdevice accessible, the user of the second wireless communication device200 may select a not-accessible option on the GUI 4110.

Alternatively, as illustrated in FIG. 41A, the second wirelesscommunication device 200 may provide a GUI 4110 for setting the range inwhich the time zone information of the second wireless communicationdevice 200 is made accessible. In this case, the second user may selectan accessible-to-all option on the GUI 4110 when the second user wantsthe time zone information of the second wireless communication device200 to be accessible to all external wireless communication devices, andmay select an accessible-to-some option on the GUI 4110 when the seconduser wants the time zone information of the second wirelesscommunication device 200 to be accessible to some external wirelesscommunication devices.

When the second user selects the accessible-to-some option on the GUI4110, as illustrated in FIG. 41B, the second wireless communicationdevice 200 may display a list including respective identificationinformation of wireless communication devices related with the secondwireless communication device 200. For example, the second wirelesscommunication device 200 may display a contact information screen. Inthis case, the second user may select external wireless communicationdevices to which the second user wants the time zone information of thesecond wireless communication device 200 to be accessible, from thedisplayed list. Alternatively, the user may select whether the time zoneinformation is available based on a group of users (i.e., family,friends, etc.).

Accordingly, the second user may set the time zone information of thesecond wireless communication device 200 to be accessible to only theexternal wireless communication devices that he or she wants.

Referring to FIGS. 40 and 41A, the second wireless communication device200 may also provide the GUI 4110 for setting the time zone informationof the second wireless communication device 200 to be made accessible asbrief information. When the second user wants the time zone informationof the second wireless communication device 200 to be made accessible asbrief information, the second user may select a brief informationdisplay option on the GUI 4110.

Accordingly, the second user may display the time zone information ofthe second wireless communication device 200 as brief informationindicating only whether the second wireless communication device 200 islocated in a region where it is a.m. or p.m., or it is morning,afternoon, or night, without displaying a detailed time of the secondwireless communication device 200.

FIGS. 42A-44B illustrate examples in which the first wirelesscommunication device 100 displays information about the user of thesecond wireless communication device 200.

FIG. 42A illustrates an example in which emotion state information ofthe user of the second wireless communication device 200 is displayed ona contact information screen of the first wireless communication device100. FIG. 42B illustrates an example in which the first wirelesscommunication device 100 displays the emotion state information of theuser of the second wireless communication device 200 when requesting acall connection to the second wireless communication device 200.

Referring to FIG. 42A, the first wireless communication device 100 mayrequest the server 300 to update the emotion state information of theuser of the second wireless communication device 200 displayed on thecontact information screen of the first wireless communication device100. The first wireless communication device 100 according to anexemplary embodiment may automatically transmit an update request forthe emotion state information of the user of the second wirelesscommunication device 200 to the server 300 when the contact informationapplication is executed. Alternatively, when the contact informationapplication is executed, the first wireless communication device 100 maytransmit the update request for the emotion state information of theuser of the second wireless communication device 200 to the server 300,based on a user input.

The first wireless communication device 100 may display theidentification information of the user of the second wirelesscommunication device 200 (for example, the name, nickname, telephonenumber, e-mail address, photograph, shortcut number, or the like of thesecond user) on the contact information screen of the first wirelesscommunication device 100.

The first wireless communication device 100 may display the emotionstate information of the user of the second wireless communicationdevice 200 within or around an area on the contact information screen onwhich the identification information of the second wirelesscommunication device 200 is displayed. For example, as illustrated inFIG. 42A, the emotion state information may be displayed as an emoticon4210. The emoticon 4210 is a pictorial symbol capable of expressingemotion, and may be an angry-face emoticon, a smiley-face emoticon, orthe like. However, exemplary embodiments are not limited thereto.

Referring to FIG. 42B, the first wireless communication device 100 mayrequest a call connection to the second wireless communication device200.

For example, the user of the first wireless communication device 100 maydirectly input identification information of the second wirelesscommunication device 200 to which a call connection is to be requested,or select the name of the user of the second wireless communicationdevice 200 (for example, Claire) from a contact information list storedin the first wireless communication device 100. When the identificationinformation of the second wireless communication device 200 is input,the user of the first wireless communication device 100 may select a‘call’ key.

In response to the ‘call’ key selection, the first wirelesscommunication device 100 may request the server 300 for the emotionstate information of the user of the second wireless communicationdevice 200 and receive the emotion state information of the user of thesecond wireless communication device 200 from the server 300, based onthe input identification information of the second wirelesscommunication device 200. Alternatively, the first wirelesscommunication device 100 may extract the emotion state information ofthe user of the second wireless communication device 200 stored in thecontact information in the first wireless communication device 100.

The first wireless communication device 100 may request a callconnection to the second wireless communication device 200 and at thesame time may display the emotion state information of the user of thesecond wireless communication device 200 on a call connection requestscreen. For example, as illustrated in FIG. 42B, the first wirelesscommunication device 100 may display the emoticon 4220 (for example, asmiley-face emoticon) indicating an emotion of the user of the secondwireless communication device 299, but exemplary embodiments are notlimited thereto.

FIG. 43A illustrates an example in which weather information of a regionwhere the second wireless communication device 200 is located isdisplayed on a contact information screen of the first wirelesscommunication device 100. FIG. 43B illustrates an example in which thefirst wireless communication device 100 displays the weather informationof the region where the second wireless communication device 200 islocated, when requesting a call connection to the second wirelesscommunication device 200.

Referring to FIG. 43A, the first wireless communication device 100 mayrequest the server 300 to update the weather information of the regionwhere the second wireless communication device 200 is located, theweather information being displayed on the contact information screen ofthe first wireless communication device 100. The first wirelesscommunication device 100 according to an exemplary embodiment mayautomatically transmit to the server 300 an update request for theweather information of the region where the second wirelesscommunication device 200 is located, when the contact informationapplication is executed. Alternatively, when the contact informationapplication is executed, the first wireless communication device 100 maytransmit to the server 300 the update request for the weatherinformation of the region where the second wireless communication device200 is located, based on a user input.

The first wireless communication device 100 may display theidentification information of the user of the second wirelesscommunication device 200 (for example, the name, nickname, telephonenumber, e-mail address, photograph, shortcut number, or the like of thesecond user) on the contact information screen of the first wirelesscommunication device 100.

The first wireless communication device 100 may display the weatherinformation of the region where the second wireless communication device200 is located, within or around an area on the contact informationscreen on which the identification information of the second wirelesscommunication device 200 is displayed. For example, as illustrated inFIG. 43A, the weather information may be displayed as a weather icon4310. The weather icon is a pictorial symbol that expresses the weather,and may be an icon indicating a fine weather, an icon indicating a cloudweather, an icon indicating a rainy weather, or the like. However,exemplary embodiments are not limited thereto.

Referring to FIG. 43B, the first wireless communication device 100 mayrequest a call connection to the second wireless communication device200.

For example, the user of the first wireless communication device 100 maydirectly input identification information of the second wirelesscommunication device 200 to which a call connection is to be requested,or select the name of the user of the second wireless communicationdevice 200 (for example, Claire) from a contact information list storedin the first wireless communication device 100. When the identificationinformation of the second wireless communication device 200 is input,the user of the first wireless communication device 100 may select a‘call’ key.

In response to the ‘call’ key selection, the first wirelesscommunication device 100 may request the server 300 for the weatherinformation of the region where the second wireless communication device200 is located, and receive the weather information of the region wherethe second wireless communication device 200 is located from the server300, based on the input identification information of the secondwireless communication device 200. Alternatively, the first wirelesscommunication device 100 may extract the weather information of theregion where the second wireless communication device 200 is located,which is stored in the contact information in the first wirelesscommunication device 100.

The first wireless communication device 100 may request a callconnection to the second wireless communication device 200 and at thesame time may display the weather information of the region where thesecond wireless communication device 200 is located on a call connectionrequest screen. For example, as illustrated in FIG. 43B, the firstwireless communication device 100 may display an icon 4320 (for example,an icon indicating fine weather) indicating the weather information ofthe region where the second wireless communication device 200 islocated, but exemplary embodiments are not limited thereto.

FIG. 44A illustrates an example in which relative location informationof the second wireless communication device 200 is displayed on acontact information screen of the first wireless communication device100. FIG. 44B illustrates an example in which the first wirelesscommunication device 100 displays the relative location information ofthe second wireless communication device 200 when requesting a callconnection to the second wireless communication device 200.

The relative location information of the second wireless communicationdevice 200 may indicate location information based on the second user.For example, the relative location information of the second wirelesscommunication device 200 may indicate whether the second user is locatedin the house, office, school, library, or the like. The relativelocation information may be determined by, for example, a wirelessaccess point to which the wireless communication device is connected orGPS information. Alternatively, a user may manually set the relativelocation information to indicate the relative location thereof.

Referring to FIG. 44A, the first wireless communication device 100 mayrequest the server 300 to update the relative location information ofthe second wireless communication device 200 that is displayed on thecontact information screen of the first wireless communication device100. The first wireless communication device 100 according to anexemplary embodiment may automatically transmit an update request forthe relative location information of the second wireless communicationdevice 200 to the server 300 when the contact information application isexecuted. Alternatively, when the contact information application isexecuted, the first wireless communication device 100 may transmit theupdate request for the relative location information of the secondwireless communication device 200 to the server 300, based on a userinput.

The first wireless communication device 100 may display theidentification information of the user of the second wirelesscommunication device 200 (for example, the name, nickname, telephonenumber, e-mail address, photograph, shortcut number, or the like of thesecond user) on the contact information screen of the first wirelesscommunication device 100.

The first wireless communication device 100 may display the relativelocation information of the second wireless communication device 200,within or around an area on the contact information screen on which theidentification information of the second wireless communication device200 is displayed. For example, as illustrated in FIG. 44A, the relativelocation information may be displayed as an icon. A relative locationinformation icon 4410 may be a house icon (i.e., an icon indicating thatthe second user is in the house), an office icon (i.e., an iconindicating that the second user is in the office), a library icon (i.e.,an icon indicating that the second user is in the library), or the like.However, exemplary embodiments are not limited thereto.

Referring to FIG. 44B, the first wireless communication device 100 mayrequest a call connection to the second wireless communication device200.

For example, the user of the first wireless communication device 100 maydirectly input identification information of the second wirelesscommunication device 200 to which a call connection is to be requested,or select the name of the user of the second wireless communicationdevice 200 (for example, Claire) from a contact information list storedin the first wireless communication device 100. When the identificationinformation of the second wireless communication device 200 is input,the user of the first wireless communication device 100 may select a‘call’ key.

In response to the ‘call’ key selection, the first wirelesscommunication device 100 may request the server 300 for the relativelocation information of the second wireless communication device 200 andreceive the relative location information of the second wirelesscommunication device 200 from the server 300, based on the inputidentification information of the second wireless communication device200. Alternatively, the first wireless communication device 100 mayextract the relative location information of the second wirelesscommunication device 200 stored in the contact information in the firstwireless communication device 100.

The first wireless communication device 100 may request a callconnection to the second wireless communication device 200 and at thesame time may display the relative location information of the secondwireless communication device 200 on a call connection request screen.For example, as illustrated in FIG. 44B, the first wirelesscommunication device 100 may display an icon 4420 (for example, a houseicon) indicating the relative location information of the secondwireless communication device 200, but embodiments of the presentinvention are not limited thereto.

FIGS. 45 and 46 are block diagrams of a structure of the first wirelesscommunication device 100, according to an exemplary embodiment.

Referring to FIG. 45, the first wireless communication device 100 mayinclude a communication unit 110, a display unit 121, and a processor130. The first wireless communication device 100 may be implemented bymore components than those illustrated in FIG. 45 or by fewer componentsthan those illustrated in FIG. 45.

For example, as illustrated in FIG. 46, the first wireless communicationdevice 100 may further include an output unit 120, a user input unit140, a sensing unit 150, an audio/video (A/V) input unit 160, and astorage unit 150, in addition to the communication unit 110, the displayunit 121, and the processor 130.

The aforementioned components will now be described in detail.

The communication unit 110 may include at least one component thatenables communication between the first wireless communication device100 and the second wireless communication device 200 or between thefirst wireless communication device 100 and the server 300. For example,the communication unit 110 may include a short-range wirelesscommunication unit 111, a mobile communication unit 112, and abroadcasting reception unit 113.

Examples of the short-range wireless communication unit 111 may include,but is not limited thereto, a Bluetooth communication unit, a Near FieldCommunication unit, a WLAN (i.e., WiFi) communication unit, a Zigbee)communication unit, an infrared Data Association (IrDA) communicationunit, an ultra wideband (UWB) communication unit, an Ant+ communicationunit, and the like.

The mobile communication unit 112 may exchange a wireless signal with atleast one selected from a base station, an external terminal, and theserver 300 on a mobile communication network. Examples of the wirelesssignal may include a voice call signal, a video call signal, and varioustypes of data generated during a short message service (SMS)/multimediamessaging service (MMS).

The broadcasting reception unit 113 receives a broadcasting signaland/or broadcasting-related information from an external source via abroadcasting channel. The broadcasting channel may be a satellitechannel, a ground wave channel, or the like. According to exemplaryembodiments, the first wireless communication device 100 may not includethe broadcasting reception unit 1130.

The communication unit 110 may receive the time zone information of thesecond wireless communication device 200 related with the first wirelesscommunication device 100 from the server 300. For example, when the timezone information of the second wireless communication device 200changes, the communication unit 110 may receive the time zoneinformation of the second wireless communication device 200 from theserver 300. The communication unit 110 may request the server 300 forthe time zone information of the second wireless communication device200 and receive the time zone information of the second wirelesscommunication device 200 from the server 300.

The communication unit 110 may transmit to the server 300 an updaterequest for contact information in the first wireless communicationdevice 100 including identification information of the second wirelesscommunication device 200, and may receive the time zone information ofthe second wireless communication device 200 as a response to the updaterequest from the server 300.

When the time of the second wireless communication device 200 reachesthe reserved sending time, the communication unit 110 may transmit areserved message to the second wireless communication device 200, basedon the received time zone information of the second wirelesscommunication device 200.

The communication unit 110 may transmit the time zone information of thefirst wireless communication device 100 to the server 300 at regularintervals. Alternatively, when an event where the time zone informationof the first wireless communication device 100 changes occurs, thecommunication unit 110 may transmit the time zone information of thefirst wireless communication device 100 to the server 300.

The output unit 120 outputs an audio signal, a video signal, or avibration signal, and may include a display unit 121, an audio outputunit 122, and a vibration motor 123.

The display unit 121 displays information that is processed by the firstwireless communication device 100. For example, when the time zoneinformation of the second wireless communication device 200 is differentfrom the time zone information of the first wireless communicationdevice 100, the display unit 121 may display the time zone informationof the second wireless communication device 200 on an area of thedisplay unit 121 that provides information about the second wirelesscommunication device 200.

The display unit 121 may display the time zone information of the secondwireless communication device 200 on the contact information in thefirst wireless communication device 100 including the identificationinformation of the second wireless communication device 200.

The display unit 121 may display the time zone information of the secondwireless communication device in a message window for exchangingmessages between the first wireless communication device 100 and thesecond wireless communication device 200. For example, the display unit121 may display the time zone information of the second wirelesscommunication device 200 on at least one region selected from a messageinput region and a message display region included in the messagewindow.

The display unit 121 may display an execution window on which an SNSapplication is executed, and may display the time zone information ofthe second wireless communication device 200 on an area on the executionwindow that corresponds to the identification information of the secondwireless communication device 200.

The display unit 121 may output a notification message indicating thattransmission of a reserved message to the second wireless communicationdevice 200 has been completed. When the time of the second wirelesscommunication device 200 reaches the call reservation time, the displayunit 121 may output a call reservation notification message, based onthe received time zone information of the second wireless communicationdevice 200.

When the display unit 121 forms a layer structure together with a touchpad to construct a touch screen, the display unit 121 may be used as aninput wireless communication device as well as an output wirelesscommunication device. The display unit 121 may include at least oneselected from a liquid crystal display (LCD), a thin filmtransistor-liquid crystal display (TFT-LCD), an organic light-emittingdiode (OLED), a flexible display, a 3D display, and an electrophoreticdisplay. According to exemplary embodiments of the first wirelesscommunication device 100, the first wireless communication device 100may include at least two display units 121.

The audio output unit 122 may output audio data that is received fromthe communication unit 110 or stored in the storage unit 170. The audiooutput unit 122 may also output an audio signal (for example, a callsignal receiving sound, a message receiving sound, a notification sound)related with a function of the first wireless communication device 100.The audio output unit 122 may include a speaker, a buzzer, and the like.

The vibration motor 123 may output a vibration signal. For example, thevibration motor 123 may output a vibration signal corresponding to anoutput of audio data or video data (for example, a call signal receivingsound or a message receiving sound). The vibration motor 123 may alsooutput a vibration signal when the touch screen is touched.

The processor 130 (central processing unit, microprocessor, etc.)controls all operations of the first wireless communication device 100.For example, the processor 130 may control the communication unit 110,the output unit 120, the user input 140, the sensing unit 150, the A/Vinput unit 160, and the like by executing programs stored in the storageunit 170.

The processor 130 may compare the time zone information of the firstwireless communication device 100 with the time zone information of thesecond wireless communication device 200. When the time zone informationof the second wireless communication device 200 is different from thetime zone information of the first wireless communication device 100,the processor 130 may control the display unit 121 to display the timezone information of the second wireless communication device 200 on thearea of the display unit 121 that provides the information about thesecond wireless communication device 200.

The processor 130 may extract the time zone information of the firstwireless communication device 100 based on the identificationinformation of the second wireless communication device 200. When theextracted time zone information of the second wireless communicationdevice 200 is different from the time zone information of the firstwireless communication device 100, the processor 130 may control thedisplay unit 121 to display the time zone information of the secondwireless communication device 200 on a dialing screen displayed before acall connection to the second wireless communication device 200.

When the processor 130 has received the location information of thesecond wireless communication device 200 from the server 300, theprocessor 130 may search for time zone information of the secondwireless communication device 200 that corresponds to the locationinformation of the second wireless communication device 200.

The user input unit 140 denotes a unit via which a user inputs data forcontrolling the first wireless communication device 100. For example,the user input unit 140 may be, but not limited to, a key pad, a domeswitch, a touch pad (e.g., a capacitive overlay type, a resistiveoverlay type, an infrared beam type, an integral strain gauge type, asurface acoustic wave type, a piezo electric type, or the like), a jogwheel, or a jog switch.

The user input 140 may receive the identification information of thesecond wireless communication device 200. For example, the user input140 may receive the name, nickname, photography, telephone number,e-mail address, or the like of the second user that uses the secondwireless communication device 200.

The user input unit 140 may receive a reserved sending time for sendinga message to the second wireless communication device 200, based on thetime zone information of the second wireless communication device 200.The user input unit 140 may also receive a call reservation time forrequesting a call connection to the second wireless communication device200, based on the time zone information of the second wirelesscommunication device 200.

The sensing unit 150 may sense the status of the first wirelesscommunication device 100 or the status of the surrounding of the firstwireless communication device 100 and may transmit informationcorresponding to the sensed status to the processor 130.

The sensing unit 150 may include, but is not limited thereto, at leastone selected from a magnetic sensor 151, an acceleration sensor 152, atemperature/humidity sensor 153, an infrared sensor 154, a gyroscopesensor 155, a position sensor (e.g., a GPS) 156, a pressure sensor 157,a proximity sensor 158, and an RGB sensor 159 (i.e., an luminancesensor). Functions of most of the sensors would be instinctivelyunderstood by one of ordinary skill in the art in view of their namesand thus detailed descriptions thereof will be omitted herein.

The A/V input unit 160 inputs an audio signal or a video signal, and mayinclude a camera 161 and a microphone 162. The camera 161 may acquire animage frame, such as a still image or a moving picture, via an imagesensor in a video call mode or a photography mode. An image captured viathe image sensor may be processed by the processor 130 or a separateimage processor (not shown).

The image frame obtained by the camera 161 may be stored in the storageunit 170 or transmitted to the outside via the communication unit 110.At least two cameras 161 may be included according to embodiments of thefirst wireless communication device 100.

The microphone 162 receives an external audio signal and converts theexternal audio signal into electrical audio data. For example, themicrophone 162 may receive an audio signal from an external wirelesscommunication device or a speaking person. The microphone 162 may usevarious noise removal algorithms in order to remove noise that isgenerated while receiving the external audio signal.

The storage unit 170 may store identification information of an externalwireless communication device (for example, the second wirelesscommunication device 200). For example, the storage unit 170 may storethe name, nick name, telephone number, e-mail address, photography,shortcut number, and the like of a user who uses an external wirelesscommunication device.

The storage unit 170 may store a program used by the processor 130 toperform processing and control, and may also store input/output data(for example, an application, content, time zone information of anexternal wireless communication device, and an address book).

The storage unit 170 may include at least one type of storage mediumselected from among a flash memory type, a hard disk type, a multimediacard micro type, a card type memory (for example, a secure digital (SD)or extreme digital (XD) memory), a random access memory (RAM), a staticrandom access memory (SRAM), a read-only memory (ROM), an electricallyerasable programmable ROM (EEPROM), a programmable ROM (PROM), magneticmemory, a magnetic disk, and an optical disk. The first wirelesscommunication device 100 may operate a web storage or a cloud server onthe internet which performs a storage function of the storage unit 170.

The programs stored in the storage unit 170 may be classified into aplurality of modules according to their functions, for example, a userinterface (UI) module 171, a touch screen module 172, and a notificationmodule 173.

The UI module 171 may provide a UI, GUI, or the like that is specializedfor each application and interoperates with the first wirelesscommunication device 100. The touch screen module 172 may detect a touchgesture on a touch screen of a user and transmit information regardingthe touch gesture to the processor 130. The touch screen module 172according to an exemplary embodiment may recognize and analyze a touchcode. The touch screen module 172 may be configured by separate hardwareincluding a controller.

In order to detect the actual touch or the proximate touch on the touchpad, the touch screen may internally or externally have various sensors.An example of the sensor used to detect the actual touch or theproximate touch on the touch screen may include a tactile sensor. Thetactile sensor detects a contact of a specific object, with asensitivity that is equal to or greater than that of human touch. Thetactile sensor may detect various types of information, such as theroughness of a contact surface, the hardness of the contact object, thetemperature of a contact point, or the like.

Another example of the sensor used to detect the actual touch or theproximate touch on the touch pad may include a proximity sensor.

The proximity sensor detects the existence of an object that approachesa predetermined detection surface or that exists nearby, by using aforce of an electro-magnetic field or infrared rays, without using amechanical contact. Examples of the proximity sensor include atransmission-type photoelectric sensor, a direct reflection-typephotoelectric sensor, a mirror reflection-type photoelectric sensor, ahigh frequency oscillation-type proximity sensor, a capacity-typeproximity sensor, a magnetic proximity sensor, an infrared-typeproximity sensor, or the like. Examples of the touch gesture of the usermay include tap, touch and hold, double tap, drag, panning, flick, dragand drop, swipe, and the like.

The notification module 173 may generate a signal for notifying that anevent has been generated in the first wireless communication device 100.Examples of the event generated in the first wireless communicationdevice 100 may include call signal receiving, message receiving, a keysignal input, schedule notification, and the like. The notificationmodule 173 may output a notification signal in the form of a videosignal via the display unit 121), in the form of an audio signal via theaudio output unit 122, or in the form of a vibration signal via thevibration motor 123.

FIG. 47 is a block diagram of a structure of the server 300, accordingto an exemplary embodiment.

Referring to FIG. 47, the server 300 may include a communication unit310, a processor 320, and a storage unit 330. The server 300 may beimplemented by more components than those illustrated in FIG. 47 or byfewer components than those illustrated in FIG. 47.

The aforementioned components will now be described in detail.

The communication unit 310 may include at least one component thatenables communication between the server 300 and the first wirelesscommunication device 100 or between the second wireless communicationdevice 200 and the server 300. The communication unit 310 may include areception unit and a transmission unit.

The reception unit may receive time zone information of the firstwireless communication device 100 from the first wireless communicationdevice 100. For example, the reception unit may receive the time zoneinformation of the first wireless communication device 100 from thefirst wireless communication device 100 at regular intervals. When anevent in which the time zone information of the first wirelesscommunication device 100 changes is generated in the first wirelesscommunication device 100, the reception unit may receive the time zoneinformation of the first wireless communication device 100 from thefirst wireless communication device 100.

The reception unit may receive time zone information of the secondwireless communication device 200 from the second wireless communicationdevice 200. The reception unit may receive an update request for thecontact information in the second wireless communication device 200 fromthe second wireless communication device 200.

The reception unit may receive setting information indicating whetherthe time zone information of the first wireless communication device 100is made accessible, from the first wireless communication device 100.

The transmission unit may transmit the time zone information of thefirst wireless communication device 100 to the second wirelesscommunication device 200 related with the first wireless communicationdevice 100. For example, when the time zone information of the firstwireless communication device 100 and the time zone information of thesecond wireless communication device 200 are different from each other,the transmission unit may transmit the time zone information of thefirst wireless communication device 100 to the second wirelesscommunication device 200.

The transmission unit may transmit the time zone information of thefirst wireless communication device 100 to the second wirelesscommunication device 200 in response to the update request for thecontact information in the second wireless communication device 200.

The transmission unit may transmit the time zone information of thefirst wireless communication device 100 to the second wirelesscommunication device 200, based on the setting information indicatingwhether the time zone information of the first wireless communicationdevice 100 is made accessible.

The transmission unit may also transmit the time zone information of thesecond wireless communication device 200 to the first wirelesscommunication device 100.

The processor 320 (microprocessor, central processing unit, etc.)controls all operations of the server 300. For example, when the timezone information of the first wireless communication device 100 haschanged, the processor 320 may search for the second wirelesscommunication device 200 related with the first wireless communicationdevice 100.

The processor 320 may compare the time zone information of the firstwireless communication device 100 with the time zone information of thesecond wireless communication device 200. When it is determined as aresult of the comparison that the time zone information of the firstwireless communication device 100 is different from the time zoneinformation of the second wireless communication device 200, thecontroller 320 may control the transmission unit to transmit the timezone information of the first wireless communication device 100 to thesecond wireless communication device 200 and the time zone informationof the second wireless communication device 200 to the first wirelesscommunication device 100.

The storage unit 330 may store a program that is used by the controller320 to perform processing, or may store input/output data. For example,the server 300 may establish time zone information database (DB),contact information DB, social media information DB, and the like. Thetime zone information DB may include the time zone information ofwireless communication devices. The contact information DB may includecontact information of wireless communication devices. The social mediainformation DB may include information about social friends of users.

The above described operations according to an exemplary embodiment maybe embodied as program commands executable by various computer means andmay be recorded on a computer-readable recording medium. Thecomputer-readable recording medium may include program commands, datafiles, data structures, and the like separately or in combinations. Theprogram commands to be recorded on the computer-readable recordingmedium may be specially designed and configured for embodiments of thepresent invention or may be well-known to and be usable by one ofordinary skill in the art of computer software. Examples of thecomputer-readable recording medium include a magnetic medium such as ahard disk, a floppy disk, or a magnetic tape, an optical medium such asa compact disk-read-only memory (CD-ROM) or a digital versatile disk(DVD), a magneto-optical medium such as a floptical disk, and a hardwarewireless communication device specially configured to store and executeprogram commands such as a ROM, a random-access memory (RAM), or a flashmemory. Examples of the program commands are advanced language codesthat can be executed by a computer by using an interpreter or the likeas well as machine language codes made by a compiler.

According to an exemplary embodiment, the first wireless communicationdevice 100 receives the time zone information of the second wirelesscommunication device 200 located in a different time zone from that ofthe first wireless communication device 100, from the server 300 or thesecond wireless communication device 200 and displays the received timezone information. Thus, the first user of the first wirelesscommunication device 100 may be prevented from contacting the seconduser of the second wireless communication device 200 when the seconduser of the second wireless communication device 200 is not available.

The exemplary embodiments should be considered in descriptive sense onlyand not for purposes of limitation. Descriptions of features or aspectswithin each exemplary embodiment should typically be considered asavailable for other similar features or aspects in other embodiments.

While the exemplary embodiments have been particularly shown anddescribed, it will be understood by those of ordinary skill in the artthat various changes in form and details may be made therein withoutdeparting from the spirit and scope of the present disclosure as definedby the following claims.

What is claimed is:
 1. An electronic device comprising: a communicationinterface configured to receive, from a first device, first time zoneinformation of the first device and to receive, from a second device,second time zone information of the second device; and a processorconfigured to: compare the first time zone information of the firstdevice with the second time zone information of the second device, whenidentification information of the second device is included in a contactlist of the first device, and control the communication interface totransmit the second time zone information of the second device to thefirst device in response to the first time zone information of the firstdevice being different from the second time zone information of thesecond device, based on a result of the comparing, wherein the secondtime zone information of the second device is displayed in the contactlist of the first device, when the first time zone information and thesecond time zone information are different from each other.
 2. Theelectronic device of claim 1, wherein the second time zone informationof the second device is displayed at a location related to an entry inthe contact list, the entry corresponding to the identificationinformation of the second device.
 3. The electronic device of claim 1,wherein the second time zone information of the second device isdisplayed in a message window of the first device for exchangingmessages between the first device and the second device.
 4. Theelectronic device of claim 1, wherein the communication interface isfurther configured to receive location information of the first device,and wherein the processor is further configured to identify the firsttime zone information of the first device corresponding to the locationinformation of the first device.
 5. The electronic device of claim 1,wherein the communication interface is configured to receive the secondtime zone information of the second device from the second device atregular intervals.
 6. The electronic device of claim 1, wherein thecommunication interface is configured to receive the second time zoneinformation of the second device from the second device, when an eventwhere the second time zone information of the second device changesoccurs.
 7. The electronic device of claim 6, wherein the processor isfurther configured to control the communication interface to transmitthe second time zone information of the second device to the firstdevice, when the second time zone information is changed from a firstvalue to a second value.
 8. The electronic device of claim 1, whereinthe communication interface is further configured to receive an updaterequest for the contact list of the first device from the first device,and wherein the processor is further configured to: update the contactlist to include the second time zone information of the second device,when the first time zone information of the first device differs fromthe second time zone information of the second device, and control thecommunication interface to transmit the updated contact list includingthe second time zone information of the second device to the firstdevice.
 9. The electronic device of claim 1, wherein the communicationinterface is further configured to receive setting information regardingwhether the second time zone information of the second device is madeaccessible, and wherein the processor is further configured to controlthe communication interface to transmit the second time zone informationof the second device to the first device, based on the settinginformation.
 10. The electronic device of claim 9, wherein the settinginformation includes information regarding devices that are allowed toaccess the second time zone information of the second device, whereinthe processor is further configured to: determine whether the firstdevice is allowed to access the second time zone information of thesecond device, based on the setting information, and control thecommunication interface to transmit the second time zone information ofthe second device to the first device, when the first device is allowedto access the second time zone information of the second device based ona result of the determining.
 11. The electronic device of claim 9,wherein the processor is further configured to control the communicationinterface to transmit brief information corresponding to the second timezone information to the first device, when the setting informationindicates that the second time zone information of the second device ismade accessible as the brief information.
 12. The electronic device ofclaim 1, wherein the processor is further configured to control thecommunication interface to transmit additional related informationregarding the second device, wherein the additional related informationincludes at least one from among emotion state information of a user ofthe second device, weather information of a region where the seconddevice is located, and relative location information of the seconddevice.
 13. A method for providing time zone information, performed byan electronic device, the method comprising: receiving, from a firstdevice, first time zone information of the first device and receiving,from a second device, second time zone information of the second device;comparing the first time zone information of the first device with thesecond time zone information of the second device, when identificationinformation of the second device is included in a contact list of thefirst device; and transmitting the second time zone information of thesecond device to the first device in response to the first time zoneinformation of the first device being different from the second timezone information of the second device, based on a result of thecomparing, wherein the second time zone information of the second deviceis displayed in the contact list of the first device, when the firsttime zone information and the second time zone information are differentfrom each other.
 14. The method of claim 13, wherein the transmittingthe second time zone information comprises transmitting the second timezone information of the second device to the first device, when thesecond time zone information is changed from a first value to a secondvalue.
 15. The method of claim 13, further comprising: receiving, fromthe first device, an update request for the contact list of the firstdevice; updating the contact list to include the second time zoneinformation of the second device, when the first time zone informationof the first device differs from the second time zone information of thesecond device; and transmitting the updated contact list including thesecond time zone information of the second device to the first device.16. The method of claim 13, further comprising: receiving settinginformation regarding whether the second time zone information of thesecond device is made accessible; and transmitting the second time zoneinformation of the second device to the first device, based on thesetting information.
 17. The method of claim 16, further comprising:when the setting information includes information regarding devices thatare allowed to access the second time zone information of the seconddevice, determining whether the first device is allowed to access thesecond time zone information of the second device based on the settinginformation; and transmitting the second time zone information of thesecond device to the first device, when the first device is allowed toaccess the second time zone information of the second device based on aresult of the determining.
 18. The method of claim 16, furthercomprising: transmitting brief information corresponding to the secondtime zone information to the first device, when the setting informationindicates that the second time zone information of the second device ismade accessible as the brief information.
 19. The method of claim 13,further comprising: transmitting additional related informationregarding the second device, wherein the additional related informationincludes at least one from among emotion state information of a user ofthe second device, weather information of a region where the seconddevice is located, and relative location information of the seconddevice.
 20. A non-transitory computer-readable recording medium havingrecorded thereon a program for executing a method of operating anelectronic device, the method comprising: receiving, from a firstdevice, first time zone information of the first device and receiving,from a second device, second time zone information of the second device;comparing the first time zone information of the first device with thesecond time zone information of the second device, when identificationinformation of the second device is included in a contact list of thefirst device; and transmitting the second time zone information of thesecond device to the first device in response to the first time zoneinformation of the first device being different from the second timezone information of the second device, based on a result of thecomparing, wherein the second time zone information of the second deviceis displayed in the contact list of the first device, when the firsttime zone information and the second time zone information are differentfrom each other.